Avast! 4 for Kerio Demo Installation Problem

I downloaded the installation file for Avast 4 for Kerio and tried to install it as a demo. When I get to the license screen and click Demo, nothing happens. The Ok button stays grayed out. I tried on Windows XP Pro SP2 and Windows 2000 Server SP4. Am I supposed to use a license file for the demo?

Kerio Mailserver 6.08 was on the computer.

You probably know by now that all demo versions ceased to function near the end of April. Alwil released a new demo that fixed this problem.

Unfortunately, the new demo doesn’t work correctly for me after installation (AVAST initializing error #152), and I don’t think they care enough to fix this problem.

Oh well.
???

How many licenses do you have on your Kerio product?
And if you click “License” in avast, does it show that it is valid?