Trouble with Latest version on a Mac

I have recently had my Mac erased due to software problems, this has deleted the Draftsight I was using.

The Mac operates on Yosemite which, I understand, doesn't get on well with the 'beta being used on the DraftSight 2015. I have tried it but the computer freezes up and crashes. It also shows an error of 'FxCrashRptApp(not responding) which internet support tells me is related to DraftSight.

I have been using the free software for years and really get on well with it. Is there a link / access to an older version which would work on my Mac - PLEASE

Debbie Shephard