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Hi, I managed to make this work by replacing the actual notepad.exe file (obviously, back up the original), with any normal executable (a C++ "hello world" is enough).
To do so, the permissions of the notepad.exe file must be altered: the file owner is set by default to TrustedInstaller, but can be changed to your user (or the admins group) and then you can enable the "Full control" permissions to be able to overwrite it.
It needs to be replaced in c:\Windows, c:\Windows\system32 and c:\Windows\SysWOW64.
After uninstalling and installing again, Notepad Replacer now works as before.