Document:

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                                                                   EXHIBIT 10.34

                               AMENDMENT NO. 1 TO
                            STOCK PURCHASE AGREEMENT

                  THIS AMENDMENT NO. 1 TO STOCK PURCHASE AGREEMENT (this
"Amendment") is made as of August 12, 2002, by and among Ziff Davis Holdings
Inc., a Delaware corporation (the "Company"), and Willis Stein & Partners III,
L.P., Willis Stein & Partners Dutch III-A, L.P., Willis Stein & Partners Dutch
III-B, L.P. and Willis Stein & Partners III-C, L.P. (collectively, the
"Purchasers"). Unless otherwise indicated, capitalized terms not defined herein
shall have the meanings assigned to such terms in the Stock Purchase Agreement
by and among the Company and the Purchasers, dated as of June 28, 2002 (the
"Pre-Amendment Stock Purchase Agreement").

                  WHEREAS, the Company, the Purchasers and certain other Persons
have entered into a Series D Preferred Stock Purchase Agreement (the "Series D
Stock Purchase Agreement") pursuant to which the Purchasers and such certain
other Persons will, among other things, purchase shares of the Company's Series
D Redeemable Preferred Stock, par value $.01 per share (the "Series D
Preferred").

                  WHEREAS, Section 8C of the Series D Stock Purchase Agreement
provides, among other things, that the purchasers of Series D Preferred shall
not be entitled to receive, and the Company shall not be permitted to make, any
cash payment from the Company to such purchasers as a result of the Company's
breach of any of the representations and warranties contained therein or made in
writing by the Company in connection therewith until the New Notes (as defined
therein) have been paid in full, together with all interest and premium, if any.

                  WHEREAS, the Company and the Purchasers desire to add to the
Pre-Amendment Stock Purchase Agreement a provision similar to the provision in
Section 8C of the Series D Stock Purchase Agreement described in the immediately
preceding recital.

                  WHEREAS, the Company and the Purchasers desire to amend the
Pre-Amendment Stock Purchase Agreement on the terms set forth herein.

                  NOW, THEREFORE, in consideration of the mutual agreements and
covenants made herein and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto, intending
to be legally bound, hereby agrees as follows:

                  1.  Amendment of the Pre-Amendment  Stock Purchase  Agreement.
Section 8C of the Pre-Amendment Stock Purchase Agreement is hereby amended by
adding the following at the end of Section 8C.

         Notwithstanding anything else contained herein to the contrary, the
         Purchasers shall not be entitled to receive, and the Company shall not
         be permitted to make, any cash payment from the Company to such
         Purchasers as a result of the Company's breach of any of the
         representations and warranties contained in this Agreement or made in
         writing by the Company in connection therewith until the

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         new senior subordinated compounding notes of Ziff Davis Media in the
         aggregate principal amount of $95,000,000 (the "New Notes") have been
         paid in full in cash, together with all interest and premium, if any.
         If any such cash payments are deferred pursuant to the immediately
         preceding sentence, the Company shall immediately make such deferred
         payment (together with interest on the amount so deferred calculated at
         a per annum rate equal to the Prime Rate (as defined below) for the
         period from when the payment was initially deferred until the time of
         actual payment) immediately upon the payment in full in cash of the New
         Notes (together with all interest and premium, if any). For purposes
         hereof, "Prime Rate" shall mean the variable rate per annum equal to
         the rate of interest most recently published by The Wall Street Journal
         as the "prime rate" at large United States money centers.

                  2. Effectiveness. Pursuant to Section 9E of the Pre-Amendment
Stock Purchase Agreement, this Amendment shall be effective and binding upon
execution hereof by the Company and the Purchasers, and the Pre-Amendment Stock
Purchase Agreement shall be deemed amended as of the date first written above
immediately following such execution by the Company and the Purchasers. Any
reference in the Pre-Amendment Stock Purchase Agreement to "Agreement" shall
hereafter be deemed to refer to the Pre-Amendment Stock Purchase Agreement as
hereby amended.

                  3. Miscellaneous.

              (a) Counterparts. This Amendment may be executed in any number of
counterparts, any one of which need not contain the signatures of more than one
party, but all of such counterparts shall constitute one amendment.

              (b) Governing Law. All issues and questions concerning the
constriction, validity, enforcement and interpretation of this Amendment shall
be governed by, and construed in accordance with, the laws of the State of New
York, without giving effect to any choice of law or conflict of law provision or
rule (whether of the State of New York or any other jurisdiction) that would
cause the application of the law of any jurisdiction other than the State of New
York. In furtherance of the foregoing, the internal law of the State of New York
shall control the interpretation and construction of this Amendment, even though
under that jurisdiction's choice of law or conflict of law analysis, the
substantive law of some other jurisdiction would ordinarily apply.

              (c) Effect on Pre-Amendment Stock Purchase Agreement. Except
as expressly modified by this Amendment, the Pre-Amendment Stock Purchase
Agreement remains in full force and effect.

                                    * * * * *

                                       -2-

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                  IN WITNESS WHEREOF, the parties hereto have executed this
Amendment No. 1 To Stock Purchase Agreement on the day and year first above
written.

                           ZIFF DAVIS HOLDINGS INC.

                           By:      /s/ Bart W. Catalane
                                    ------------------------------------
                           Its:     Chief Operating Officer and
                                    Chief Financial Officer

                           WILLIS STEIN & PARTNERS III, L.P.
                           WILLIS STEIN & PARTNERS DUTCH III-A, L.P.
                           WILLIS STEIN & PARTNERS DUTCH III-B, L.P.
                           WILLIS STEIN & PARTNERS III-C, L.P.

                           By:  Willis Stein & Partners Management III, L.P.
                           Its: General Partner

                           By:  Willis Stein & Partners Management III, L.L.C.
                           Its: General Partner

                           By:      /s/ Daniel H. Blumenthal
                                    ------------------------------------
                           Name:    Daniel H. Blumenthal
                           Title:   Member<PAGE>

                                                                   EXHIBIT 10.35

                               AMENDMENT NO. 1 TO
                            STOCK PURCHASE AGREEMENT

                  THIS AMENDMENT NO. 1 TO STOCK PURCHASE AGREEMENT (this
"Amendment") is made as of August 12, 2002, by and among Ziff Davis Holdings
Inc., a Delaware corporation (the "Company"), and Willis Stein & Partners III,
L.P., Willis Stein & Partners Dutch III-A, L.P., Willis Stein & Partners Dutch
III-B, L.P. and Willis Stein & Partners III-C, L.P. (collectively, the
"Purchasers"). Unless otherwise indicated, capitalized terms not defined herein
shall have the meanings assigned to such terms in the Stock Purchase Agreement
by and among the Company and the Purchasers, dated as of August 8, 2002 (the
"Pre-Amendment Stock Purchase Agreement").

                  WHEREAS, the Company, the Purchasers and certain other Persons
have entered into a Series D Preferred Stock Purchase Agreement (the "Series D
Stock Purchase Agreement") pursuant to which the Purchasers and such certain
other Persons will, among other things, purchase shares of the Company's Series
D Redeemable Preferred Stock, par value $.01 per share (the "Series D
Preferred").

                  WHEREAS, Section 8C of the Series D Stock Purchase Agreement
provides, among other things, that the purchasers of Series D Preferred shall
not be entitled to receive, and the Company shall not be permitted to make, any
cash payment from the Company to such purchasers as a result of the Company's
breach of any of the representations and warranties contained therein or made in
writing by the Company in connection therewith until the New Notes (as defined
therein) have been paid in full, together with all interest and premium, if any.

                  WHEREAS, the Company and the Purchasers desire to add to the
Pre-Amendment Stock Purchase Agreement a provision similar to the provision in
Section 8C of the Series D Stock Purchase Agreement described in the immediately
preceding recital.

                  WHEREAS, the Company and the Purchasers desire to amend the
Pre-Amendment Stock Purchase Agreement on the terms set forth herein.

                  NOW, THEREFORE, in consideration of the mutual agreements and
covenants made herein and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto, intending
to be legally bound, hereby agrees as follows:

                  1. Amendment of the Pre-Amendment Stock Purchase Agreement.
Section 8C of the Pre-Amendment Stock Purchase Agreement is hereby amended by
adding the following at the end of Section 8C.

         Notwithstanding anything else contained herein to the contrary, the
         Purchasers shall not be entitled to receive, and the Company shall not
         be permitted to make, any cash payment from the Company to such
         Purchasers as a result of the Company's breach of any of the
         representations and warranties contained in this Agreement or made in
         writing by the Company in connection therewith until the

<PAGE>

         new senior subordinated compounding notes of Ziff Davis Media in the
         aggregate principal amount of $95,000,000 (the "New Notes") have been
         paid in full in cash, together with all interest and premium, if any.
         If any such cash payments are deferred pursuant to the immediately
         preceding sentence, the Company shall immediately make such deferred
         payment (together with interest on the amount so deferred calculated at
         a per annum rate equal to the Prime Rate (as defined below) for the
         period from when the payment was initially deferred until the time of
         actual payment) immediately upon the payment in full in cash of the New
         Notes (together with all interest and premium, if any). For purposes
         hereof, "Prime Rate" shall mean the variable rate per annum equal to
         the rate of interest most recently published by The Wall Street Journal
         as the "prime rate" at large United States money centers.

                  2. Effectiveness. Pursuant to Section 9E of the Pre-Amendment
Stock Purchase Agreement, this Amendment shall be effective and binding upon
execution hereof by the Company and the Purchasers, and the Pre-Amendment Stock
Purchase Agreement shall be deemed amended as of the date first written above
immediately following such execution by the Company and the Purchasers. Any
reference in the Pre-Amendment Stock Purchase Agreement to "Agreement" shall
hereafter be deemed to refer to the Pre-Amendment Stock Purchase Agreement as
hereby amended.

                  3. Miscellaneous.

              (a) Counterparts. This Amendment may be executed in any number of
counterparts, any one of which need not contain the signatures of more than one
party, but all of such counterparts shall constitute one amendment.

              (b) Governing Law. All issues and questions concerning the
constriction, validity, enforcement and interpretation of this Amendment shall
be governed by, and construed in accordance with, the laws of the State of New
York, without giving effect to any choice of law or conflict of law provision or
rule (whether of the State of New York or any other jurisdiction) that would
cause the application of the law of any jurisdiction other than the State of New
York. In furtherance of the foregoing, the internal law of the State of New York
shall control the interpretation and construction of this Amendment, even though
under that jurisdiction's choice of law or conflict of law analysis, the
substantive law of some other jurisdiction would ordinarily apply.

              (c) Effect on Pre-Amendment Stock Purchase Agreement. Except as
expressly modified by this Amendment, the Pre-Amendment Stock Purchase Agreement
remains in full force and effect.

                            *   *   *   *   *

                                      -2-

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have executed this
Amendment No. 1 To Stock Purchase Agreement on the day and year first above
written.

                                            ZIFF DAVIS HOLDINGS INC.

                             By:    /s/ Bart W. Catalane
                                    --------------------
                             Its:   Chief Operating Officer and
                                    Chief Financial Officer

                             WILLIS STEIN & PARTNERS III, L.P.
                             WILLIS STEIN & PARTNERS DUTCH III-A, L.P.
                             WILLIS STEIN & PARTNERS DUTCH III-B, L.P.
                             WILLIS STEIN & PARTNERS III-C, L.P.

                             By:  Willis Stein & Partners Management III, L.P.
                             Its: General Partner

                             By:  Willis Stein & Partners Management III, L.L.C.
                             Its: General Partner

                             By:    /s/ Daniel H. Blumenthal
                                    ------------------------
                             Name:  Daniel H. Blumenthal
                             Title: Member

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