Exhibit 10.8





FOURTH AMENDMENT TO
REVOLVING CREDIT AND SECURITY AGREEMENT

THIS FOURTH AMENDMENT
TO REVOLVING CREDIT AND SECURITY AGREEMENT, dated as of September 10, 2018 (this “Amendment”), is entered into
by and among COOPER RIVER LLC, a Delaware limited liability company, as borrower (the “Borrower”), the
LENDERS party hereto, CITIBANK, N.A. (“Citibank”), as administrative agent for the Secured Parties (as hereinafter
defined) (in such capacity, the “Administrative Agent”), CITIBANK, N.A., acting through its Agency & Trust
division (“Citibank Agency & Trust”), as collateral custodian for the Secured Parties (in such capacity,
the “Custodian”) and as collateral agent for the Secured Parties (in such capacity, the “Collateral
Agent”), and VIRTUS GROUP, LP (“Virtus”), as collateral administrator (in such capacity, the “Collateral
Administrator”).



R E C I T A L S



WHEREAS, certain of
the above-named parties have entered into that certain Revolving Credit and Security Agreement, dated as of May 29, 2015 (as amended,
the “Agreement”), by and among the Borrower, the Lenders from time to time party thereto, the Administrative
Agent, the Collateral Agent, the Custodian and the Collateral Administrator; and



WHEREAS, pursuant to
and in accordance with Section 12.01(b) of the Agreement, the parties hereto desire to amend the Agreement in certain respects
as provided herein.



NOW, THEREFORE, based
upon the above Recitals, the mutual premises and agreements contained herein and other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the undersigned, intending to be legally bound, hereby agree as follows:



SECTION
1.Definitions.



Each capitalized term
used but not defined herein has the meaning ascribed thereto in the Agreement.



SECTION
2.Amendments
to the Agreement. The parties hereto agree that Section 1.01 of the Agreement is hereby amended by restating the definition
of “Reinvestment Period” as follows:



“Reinvestment
Period” means the period from and including the Closing Date to and including the earliest of (a) November 30, 2018 (or
such later date as may be agreed by the Borrower and the Lenders); and (b) the date of the termination of the Commitments pursuant
to Section 6.02.



SECTION
3.Agreement
in Full Force and Effect as Amended.



Except as specifically
amended hereby, all provisions of the Agreement shall remain in full force and effect. This Amendment shall not be deemed to expressly
or impliedly waive, amend or supplement any provision of the Agreement other than as expressly set forth herein and shall not constitute
a novation of the Agreement.













SECTION
4.Representations
and Warranties.



The Borrower hereby
represents and warrants as of the date of this Amendment as follows:



(a)this Amendment and each other Facility Document entered into on the date hereof has been duly executed and delivered by
it;



(b)this Amendment and each other Facility Document entered into on the date hereof constitutes its legal, valid and binding
obligation, enforceable against it in accordance with its terms, except as enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting the enforcement of creditors’ rights generally or by general
principles of equity; and



(c)there is no Event of Default or Default that is continuing or would result from entering into this Amendment.



SECTION
5.Conditions
to Effectiveness.



The effectiveness of
this Amendment shall be subject to the receipt by the Administrative Agent of executed counterparts of this Amendment.



SECTION
6.Miscellaneous.



(a)This Amendment is a Facility Document for all purposes of the Agreement. This Amendment may be executed in any number of
counterparts (including by facsimile or electronic mail), and by the different parties hereto on the same or separate counterparts,
each of which shall be deemed to be an original instrument but all of which together shall constitute one and the same agreement.



(b)The descriptive headings of the various sections of this Amendment are inserted for convenience of reference only and shall
not be deemed to affect the meaning or construction of any of the provisions hereof.



(c)This Amendment may not be amended or otherwise modified except as provided in the Agreement.



(d)The failure or unenforceability of any provision hereof shall not affect the other provisions of this Amendment.



(e)Whenever the context and construction so require, all words used in the singular number herein shall be deemed to have been
used in the plural, and vice versa, and the masculine gender shall include the feminine and neuter and the neuter shall include
the masculine and feminine.



(f)This Amendment represents the final agreement between the parties only with respect to the subject matter expressly covered
hereby and may not be contradicted by evidence of prior, contemporaneous or subsequent oral agreements between the parties. There
are no unwritten oral agreements between the parties.



(g)THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED AND
INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.



(h)The Administrative Agent authorizes and directs the Collateral Agent, the Collateral Administrator and the Custodian to
enter into this Amendment.



[Remainder of Page
Intentionally Left Blank]



2







IN WITNESS WHEREOF,
the undersigned have caused this Amendment to be executed by their respective officers thereunto duly authorized, as of the date
first written above.





| | COOPER
    RIVER LLC, as Borrower                       |                        
| | ------------------------------------------------------- | -----------------------
| |                                                         |                        
| |                                                         |                        
| | By:                                                     | /s/
    William Goebel 
| |                                                         | Name:                  
| |                                                         | Title:                 
| |                                                         |                        
| |                                                         |                        
| | FS
    INVESTMENT CORPORATION II, as Collateral Manager
| |                                                         |                        
| |                                                         |                        
| | By:                                                     | /s/
    William  Goebel
| |                                                         | Name:                  
| |                                                         | Title:                 







Fourth Amendment to Revolving Credit and Security Agreement











| | CITIBANK, N.A., as Administrative Agent and a Lender
| | ----------------------------------------------------
| |                                                     
| |                                                     
| | By:                                                 
| |                                                     
| |                                                     





Fourth Amendment to Revolving Credit and Security Agreement











| | GUARDIANS OF NEW ZEALAND SUPERANNUATION AS MANAGER AND ADMINISTRATOR OF THE NEW ZEALAND SUPERANNUATION FUND IN ACCORDANCE WITH THE NEW ZEALAND SUPERANNUATION AND RETIREMENT INCOME ACT 2001, as a Lender
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |                                                                                                                                                                                                          
| |                                                                                                                                                                                                          
| | By:                                                                                                                                                                                                      
| |                                                                                                                                                                                                          
| |                                                                                                                                                                                                          
| |                                                                                                                                                                                                          





Fourth Amendment to Revolving Credit and Security Agreement









| | CITIBANK,
    N.A., as Collateral Agent                       |                         
| | ------------------------------------------------------------- | ------------------------
| |                                                               |                         
| |                                                               |                         
| | By:                                                           | /s/
    Valerie Delgado 
| |                                                               | Name:                   
| |                                                               | Title:                  
| |                                                               |                         
| |                                                               |                         
| | VIRTUS GROUP, LP,as Custodian and as Collateral Administrator
| |                                                               |                         
| |                                                               |                         
| | By:                                                           | /s/
    Joseph U. Elston
| |                                                               | Name:                   
| |                                                               | Title:                  







Fourth Amendment to Revolving Credit and Security Agreement