KBAP - patch requires serial?

[tasmaniak]

I downloaded the Kings Bounty Armoured Princess patch and now have to enter a serial number. What? Why? How can I enter one when I have the original game in my hand right now and con't find a serial anywhere? I've been playing for weeks and was really enjoying this game. I've never had to enter a serial before. If I have to re-install the game I probably won't be bothered playing thru all those quests again. C'mon guys, someone help me out here. Where is the serial number? How can I uninstall the patch? I just want to get back to Elon safely...