Do proper environment variable detection for R_LIBS and R_LIBS_USER which may be set on the users machine. Previously, the install may have worked from R, but the linkage would fail because we didn't detect these settings.
Fix the ArcGIS Pro registry search.
Provide a new function which lists all R library locations that ArcGIS can locate, provide this in the "R Install Details" script results.
R_LIBSandR_LIBS_USERwhich may be set on the users machine. Previously, the install may have worked from R, but the linkage would fail because we didn't detect these settings.