Download and install any Autodesk Product for Mac.
Use as Serial 666-69696969, 667-98989898, 400-45454545 066-66666666 or anything matching those templates.
Choose a Product Key for your product from the list below.
I suggest blocking outgoing traffic (Faster and easier to activate).
Before clicking on Activate, you have 2 options : (Choose option A or B.)
-A) Disable Your network Card, pull the network cable out or block with firewall (This is just to disable online checks). It may tell you an internet connection is required, simply click on close and click on activate again.
-B) Click on Activate and it will make some online checks, simply click on close and click on Activate again.
Select I have an activation code from Autodesk
Once you’re at the activation screen, start XFORCE OSX Keygen 
Click on Mem Patch (You should see successfully patched message).
Copy the request code into the keygen and press generate.
Now copy the activation code back to the activation screen and click Next
You have a fully registered Autodesk product.