Just playing around since my key hit the activation limit. To reset this you must contact the original developer and hopefully they reset the activation count. This will accept any name and key and permanently activate ProScan. This must be applied to v17.0 first, then any version should work.
This requires xdelta3 to apply the patch. Copy
the xpatch file to your proscan directory, open and administrative powershell, and run
the following commands.
mv .\ProScan.exe .\ProScan.orig.exe
xdelta3 -d -s .\ProScan.orig.exe .\ProScan.v17.xpatch .\ProScan.exe
To accomplish this I used dnSpy to debug the app until I got to the enter key page. Once
on this page I clicked the pause button and looked at the call stack to see where the last
instance of ProScan.exe was. This lead me to the activation dialog code. Looking at what
happens when clicking the OK button you can see that it calls an API, then based on a numerical
code it displays different messages. I removed the call to the activation server and then
forced the logic to the Activation Successful conditional branch. It saves some stuff in
a very obscure registry location, located in HKCU/Software/Microsoft/Environment. After this
the program is considered activated, and never checks with the server again. On restarting the
program, it reads from the registry and is still considered Registered & Activated.
update this