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Hello @rmaynard,
To Force Quit on a Mac of an application try:
- Choose Force Quit from the Apple menu, or press Command-Option-Esc. This is similar to pressing Control-Alt-Delete on a PC.
- Select the unresponsive app in the Force Quit window, then click Force Quit.
Then, try installing again.
You can also try to Shut Down and run the installer for the software again. Thank you for posting. 
Natasha
Community Product Support Specialist
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Welcome to the community..
Forum users do not email you directly and you shouldn't provide your personal email here. This is a world wide user forum.. 
I'm not a MAC user but it sounds like you have the A360 service installed and its running. Under MAC OS locate services or whatever its called and stop the A360 process or follow this article.
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
First of all, what MAC OS are you running? Is it listed as a supported OS for AutoCAD for MAC?
If this information was helpful, please consider using the Accept Solution
Darin Green
Director of Customer Support
Synergis Engineering Design Solutions
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