isdone.dll and unarc.dll errors

Question

good morning,
I'm trying to install some very compressed game packages using different PCs (for example: Ace Combat 7 Skies Unknown v1.0.1 (Monkey Repack) [FitGirl Repack] and RESIDENT EVIL 2 Deluxe Edition + 9 DLCs [FitGirl Repack]).
If I use the sandboxie, a very common error appears regarding two isdone.dll and unarc.dll libraries that promptly disappears by installing the package outside the sandbox.
thank you

Lucky Sawyer · Answer

I solved this poblem by changing from within the Sandbox the "system variables" setting for TMP, TEMP folders to an empty folder outside of my system profile (this is for preventing any sandboxed processes from modyfying files in my real temporary folder), then enabling Full access to that specific folder in the Sandbox settings. In that case unpacking completes without any errors. After a successful installation the changed settings can be safely reverted. 
 These errors are obviously caused by the more strict access rights and permissions policy introduced in Win 10. I never faced issues like that with Win 7 or 8. Hopefully, I do not put my system at risk by making an empty non-system folder accessible and perhaps there might be a more subtle and secure solution too.