I've just acquired TibEd, but attempting to run it to mod RA2 or YR gives me an error "Runtime Error '9': Subscript Out Of Range." The error also occurs if I attempt to select a Tiberian Sun version.
Thing I've tried so far, in chronological order:
Installing Visual Basic 6 Service Pack 6
Installing Visual Basic 6 Service Pack 5
Setting TibEd to run as administrator
Setting TibEd to use various compatibility settings (Windows 7, Windows Vista SP2, Windows XP SP3)
Restarting my computer after doing the above and trying again
Uninstalling and re-installing TibEd
Setting the RA2YR directory in TibEd preferences to a fresh installation
Google seems to show that "runtime error 9" isn't a phrase exclusive to TibEd and that the problem is related to Visual Basic in some way, but as I've already tried installing the service packs I'm not sure where to go from here.
Edit: I'm running Windows 10 x64.