nevermind...

have since figured the whole thing out...

as for anyone else who might be curious in the near future: You cannot install RTR 6.2 or 6.0 gold unless you have a CLEAN version of RTW1.2 on your computer, no BI. If you have patched BI or RTW beyond a clean slate 1.2, you would need to delete ALL rtw files from you computer (completely uninstall) and then reinstall RTW, patch it to 1.2, forget about BI and go install RTR version you want.

For me, it's kinda too late, I'm 50 years into my Saxon Campaign

certainly not going to just uninstall heh