Help Me Run Two Independant Versions Of Sonar

I have independent versions of 8.5, X1, X2, X3 and Platinum on my PC, all running independently.... but not at the same time, because I only have one audio interface, and SONAR would like exclusive-ish use of it.
 
If I had two independent audio interfaces, then I suspect I could pick any two versions of SONAR and run them simultaneously. I've never tried this.

While all versions of SONAR share utilities and plug-ins, the core program and configuration are installed in separate directories by version. Both X3 and Platinum will co-exist on the same PC.

Make it easy on yourself. Add what you don't already have, which would be the SONAR Platinum core, ProChannel Collection, Anderton Collection, AD2 and Help and Tutorials (if you use local help). You can overwrite all the other stuff if you wish but I would definitely recommend skipping DimPro, Rapture and Melodyne.

It's clever enough to not install in to the same directory as older versions. There has been some debate about whether to import preferences from your old version, but it *is* worth looking in "Preferences" under file locations - to see if you agree with them.
 
My installation actually pointed to some X3 folders - where I'd prefer it point to Platinum folders.
YMMV though...

This issue is the number of licenses not what version is being run. Only one instance of SONAR may be run per license. When upgrading from X2 to X3 or X3 to Platinum, there is still only one license, so only one instance may be run. If one purchases two retail copies of SONAR than two instances may be run at a time.

TremoJem - I believe there are no upgrades to Melodyne from X3 to Platinum.  As for TH2 - No upgrades here either, BUT there are the addition of "CA Amps" in the Audio FX section (for Pro Channel), which Craig Anderton designed and these additions are Killer Cool if you need good Guitar Amp Sims.