What a ridiculous test. I finally was able to resolve this error by manually installing webtoolsextensionsvs14.msiwith msiexec and specifying targetdir c:\temp. For some reason, he tried to create temp installation files directly inc:\
msiexec /a webtoolsextensionsvs14.msi /qb /l* log.txt SKIP_SETUP=1 TARGETDIR=
c:\temp
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