Various sites have one or another version.
Free Adobe Acrobat Readers are available for most computer platforms. Originally it was only available in the Windows NT DDK which had to be downloaded in one huge package. It is now available in the Windows 98 DDK which can be downloaded in pieces. Assuming that you only want MASM and a linker here is the minimum you need to download and do. 98 DDK Download page, scroll down to the individual components section.