1. Install Inventor Pro 2009.
2. Start Autodesk Invetor Pro 2009 and Select Activate the Product 
   when ask for activation,  select Enter an Activation Code
   Use as serial : 653-12354321 or 666-98989898 or 666-69696969
   Write down the request code.
3. Fire up the xforce keygen and generate an activation code
   based on your request code. Continue the registration process
   Copy and paste your generated activation code ..
   Restart Inventor
4. Enjoy!
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