1. install software
2. run the License Manager.exe from your installation folder or Start Button
3. click on "Manually activate using email" and copy the installation ID
4. run the keygen, choose your product, paste the previous installation ID
5. Hit "generate", get the Unlock Code and paste it to the license manager
6. Hit Activate, you're done. Enjoy!

Note: in Vegas, the license manager could be launched automatically if you select the pluraleyes extension to use it.
