Hey there! No, old Bosca doesn’t affect the new version in any way. Are you familiar with the command line/terminal for your operating system? Could you open it from the folder where you unzipped to and run Bosca Ceoil Blue this way? This should show some errors if the problem is with the app.
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Hmm, there shouldn’t be any difference whatsoever whether you start the .exe from the File Explorer or from a terminal. Can it be that it’s your antivirus/antimalware software blocking it, perhaps? Not sure what else to suggest here, because that’s a pretty unusual circumstance.
If there aren’t any errors when running from the command line, we can only guess about the source of the issue. I guess you can try making a .bat file in the same directory to execute the same command line operation with just a click, so it’s less cumbersome.
Sorry if I can’t be of any more help, but I’m really confused by your findings.