1.Install Autodesk OSX 2013 Products
  Select Install as Trial

2.Finish the installation & restart Autodesk Product

3.Use as Serial 666-69696969, 667-98989898, 400-45454545 066-66666666 .. 
  or anything matching those templates for activation

4.Use the Product Key matching .
  The product Key can be find in a file called MID.txt
  in the root of the dmg file.
  It will look like this : Part Number: xxxE1-123456-123456...
  What you want is the xxxE1 number  
  

5.Before clicking on Activate
  You have 2 options :
   - a) Disable Your network Card, pull the network cable out or block with firewall
     (this is just to disable online serial check)
OR 
   - b) Click on Activate and it will tell you that your serial is wrong, simply click
     on close and click on activate again.

Choose option a or b.

6. Select I have an activation code from Autodesk
    
7.Once at the activation screen: 
  start XFORCE OSX Keygen 
  
8.Click on Mem Patch (you should see successfully patched)

9.Copy the request code into the keygen and press generate

10.Now copy the activation code back to the activation screen and click Next
  You have a fully registered autodesk product




