sharp cape
Let's try again...
Uninstall GFN normally first, after that, Do Win+R and type in %appdata%
(Before doing this, make sure GFN is uninstalled if you had it installed previously and also close the app)
And after that, delete anything related to GeForce NOW, not NVIDIA Corporation,
After that, exit the roaming folder and enter the Local folder and do the same.
Then download the GFN installer from NVIDIA's website and use that installer.