I tried to install unify qt wallet and its not working. how can I resolve this issue?
Since it's about permission, have you checked the permission of the unify qt (if you have full control on it)?
If yes, some other possible reasons are:
[1] Your anti-virus is blocking the software. There have been cases like this before, I experienced it, however, it was blocked right before finishing the download. As far as I remember they solved the issue for most AV, but still try checking by turning your AV off and run the unify qt.
[2] The file location is different or the file is corrupted. Double check and make sure that the unify qt is not corrupted or removed/transferred in a different location especially if you're using a shortcut in opening it. You could delete and download it again, just make sure you have a back up of your wallet.dat