On Windows PCs, GEMPACK programs look for the GEMPACK licence as follows.
So your licence file must always be called LICEN.GEM (even if we send it to you with a different name).
Instructions for setting the Environment variable GPDIR may be found here.
If a Windows GEMPACK program (for example, ViewHAR or ViewSOL) has problems finding your GEMPACK licence, please follow this link.
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GEMPACK FAQ Page