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One other thing to try is to go into the prerequisites folder in the installer and go into the VC_80 and VC_90 folders and install the 32-bit and 64-bit installers in both those folders. All the workstations I had issues with during our 14.1 to 16.1 upgrade, I was able to install by either installing those pre-reqs manually, or using the UNC path as above.
Hello SSteve and thank you Solutionworx! I would recommend visiting the Sage Knowledgebase for solutions in case you still have the error after installing the VC_80 and VC_90 prerequisites (see support.na.sage.com/.../viewdocument.do.