I finally managed to create the project in 2013r4.1 by opening the IDE as well 2023r2 at the same time. Drag and drop modules between IDEs did nothing and copy and paste everything crashed the IDE.
However, by creating an empty project with an empty folder to put everything in I was able to copy and paste almost everything across.
Exceptions - Pasting the App class caused an immediate crash so I opened the events and copied the code across separately. The images had to be imported again from the original jpg and png files.
Of course I’ll have to re-instate some depreciated code but not too hard with Find and Replace.
All works fine except I’ve lost the Datepicker as it wasn’t around in 2013 so will have to find an alternative.
Then I can build it for XP, Win7 and Win8 after transferring one of my licences to this machine.