Downgrade / two different Engine versions work together?

Hi guys,
I´m the audio guy for our game design team and I work on a mac with os 10.9.5 for several reasons.
Recently I launched UE4 again after a long time, updated and now the version isn´t compatible anymore with my os and crashes immediately on launch.
The rest of the team is on windows and is using the newest version after the update.

Is there a way for me to downgrade my UE4 version and still be able to work together with the rest of the team? (We are using a SVN server)
All I need to do is install the fmod plug-in, place some sound assets and do some sound behaviour blueprint programming.

Appreciate your help