1.Install Autodesk AutoCAD for Mac 2016
  Select Install as Trial (in most cases)
  You can also try to put a serial and the product key

IF YOU ENCOUNTER AN ERROR WHILE TRYING TO OPEN Autodesk_AutoCAD_2016_English_Mac_OSX.dmg THEN, SKIP THE VERIFYING PROCESS QUICKLY AFTER OPENING THE DMG.

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 (not always)
  in the root of the dmg file.
  It will look like this : Part Number: xxxF1-123456-123456...
  What you want is the xxxF1 number. You may also get it after installing in Trial
  and Activating within the application.  
  

THE PRODUCT KEY FOR AUTOCAD 2016 FOR MAC IS 777H1


ACTIVATION : We suggest blocking outgoing traffic (faster and easier to activate)

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 checks). It may tell you an internet connection is required
     simply click on close and click on activate again.
OR 
   - b) Click on Activate and it will make some online checks, 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 xf-adsk2016 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. 

SOMETIMES (ALMOST ALWAYS), YOU NEED TO TYPE THE ACTIVATION CODE MANUALLY