Been trying to install Fopnu 1.53 and keep getting this error:

"Windows cannot access the specified device, path or file. You may not have the appropriate permissions to access the item.

I'm the admin, all permissions are full control, no anti-virus on...it won't let me install. Any ideas?

See issue here as well: https://forum.fopnu.com/support/46

Here is what happened essentially:
I had the exact same issue happen with Tixati (twice)- where it was automatically uninstalled and this week after running fopnu for nearly 6 months it was uninstalled upon a reboot automatically with no warning.

Fortunately when you re-install, the configurations are restored and not reset.