TSMGUI error while installing 1991 track pack and PLUS

Posted by securitynotsecure 
"not enough access rights on this disk." - what does this mean and how do i fix it?

i followed what the error message told me on the gp4.exe and the individual .tsm files, but this error still persists.

full error message here:
[ibb.co]

Help is much appreciated.
OS? Where do you have Zaz Tools installed?
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