[Qgis-user] How to run synchronously stable and unstable qgis versions

[Nikos Alexandris]

Hi list!

With grass it is possible to compile && install && run grass64, grass65,
grass7, etc.

When compiling && installing qgis from source it's always _one_ binary
called qgis. How could I do with qgis the same as I do with grass?

Kindest regards, Nikos
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P.S. My actual problem is that I am unable to use "old" qgis project
files. Is there a work-around or an import/convert old _qgs_ files?