I have DavsIDE working now, running the generated EXE after the QB64 compiler compiles the source code.
What I did was to uninstall the QB64 versions, both 1.3 and 1.4, by deleting the folders containing them, and then reinstalling the versions in these folders:
- C:\qb64_1.3_win_x86\qb64
- C:\qb64_1.4_win-x86\qb64
Then running only one instance of DavsIDE when testing (I had two instances of it open at the same time!) I was able to switch back and forth between the versions by setting the Compiler options.
Thank you Dav and everyone for your suggestions regarding this.