[skiffle]

I am currently running PT 9MP with Projectmix I/O
I am about to upgrade to PT 10 or maybe 11 or 12, i would like to keep my PT 9MP as i have a lot of projects that i often re-visit and work on, is it possible to run both MP9 and the new upgrade on the same Macbook pro OS X 10.6.8, or is there a way of opening MP9 projects in PT 10, 11, or 12, or do i have to uninstall MP9 altogether and forget about all my past unfinished projects? Ideally it would be great to shut down one and open up the other depending on what i want to work on!
Any help on this issue would be much appreciated, Thanks!
Skiffle