Just in case others are reading this.
If you get the error message 'This app can't run on your PC' on Windows 10, then try to un-install and re-install the software again.
If you get a registration form that is blank, and the error message 'No product has been found to register. The application will close'. Then your anti-virus software will have removed the 'BookFolding.exe' program.
You will need to add the 'BookFolding.exe' program, to the list of 'Trusted Programs'.
Ian