RevDeBug functions as a plugin for Visual Studio. To activate all of its functions, you must have valid license attached.
After installing RevDeBug 30 days trial will be granted for you automatically, so you will not have to worry about anything, you can start Recording right away.
If you bought, or won personal license you can activate it by going to the RevDeBug menu, About.
In the About window, click Load license file and select your license.