For some unexplained reason my AutoCAD 2013 for MAC stopped working, and it was recommended that I upgrade to the current version of OS-X anyway. I did so, and it did not fix anything. So I tried installing ACAD 2014 and 2015 for Mac several times. In both cases near the begining of installation a message pops up saying that an instance of Autodesk 360 has been detected, and must be closed before installation can continue. I don't have any such program on my computer. I've attempted various combinations of deleting all Autodesk products from my computer, restarting, and reinstalling many times. To no avail. Please help.
Please, check that there is no Autodesk 360 icon on menu bar. If you have it - then right-click on it and select "Exit"
If you have it - then select it and pick on Force quit button.
If you don't have it among processes, than go to Mac System Preferences, Users and Groups pane, select your name in Users list, on the right side switch to Login items, find Autodesk 360, select it and pick on "-" button to remove from list.
Restart your Mac and try to run installation again.
Thanks,
Terry Chen
A360 Desktop Team