Hey there! Sorry about this issue, we will be fixing this in the next update of Patch My PC.
The workaround for now is: open registry, browse to "HKEY_LOCAL_MACHINE\SOFTWARE\Patch My PC\Options"
And in "PortableAppPath" you can change the "Value data" which is the path to the portable apps.
But make sure that Patch My PC is closed first

Sorry about this again, and I hope this fixes the issue for now