Hi @Anonymous,

I see that you are visiting as a new member to the AutoCAD for Mac forum. Welcome to the Autodesk Community!

AutoCAD 2015 for Mac is not supported or designed for High Sierra. I would be very careful running this configuration.  If you must stay with that version on the two workstations, I recommend down-grading the OS.

File format for AutoCAD 2013-2017 is the same so you should not have issues opening and sharing your files between these versions.

Please select the Accept as Solution button if my post solves your issue or answers your question.