AutoCAD for Mac 2015 is compatible with Mac OSX Yosemite (10.10). AutoCAD for Mac versions 2014 and earlier currently are not compatible with Mac OSX Yosemite (10.10). These versions may launch, but will not operate properly and damage to your project data could occur.
We strongly encourage you to carefully check operating system compatibility with your version of AutoCAD for Mac before upgrading your Mac to OSX 10.10 (Yosemite)

One solution is having a partition (or a separate drive) with a compatible system on it and install your software on it.

You then can boot into this system and run your program on it.