Q: Can I keep older versions of Vegas Movie Studio installed on my computer when I upgrade to a newer version?
Answer: Yes you can keep older versions of Vegas installed on your computer.
I personally have Versions 9 to 12 all installed mainly for training purposes, because I still get questions from people using the older versions.
New Blue Fx and Production Suite Users
Older NewBlue Fx will Automatically appear in V12 of Movie Studio Platinum Suite.
However, remember that they will only show up in the 32bit version of Movie Studio, now that V12 comes in a 64bit version as well.
There is one program that you must un-install if you have it.
If you have "Vegas Movie Studio HD Platinum 11 Production Suite" installed
You installed the NewBlue Titler that came with V11 Production Suite,
then please un-install old version of NB Titler first.
Because if you install the updated version from the V12 Suite and the updated NB Titler, it may cause chaos.
In Windows Control Panel – Programs and Features – the OLD Titler ends with MSPPS – V1.0
New version is V2.0