IIRC, you could click it away instantly before the 30 days are over and have to wait for about 30 seconds after. Perhaps some people didn't wait the 30 seconds.
I know that was the case for 6.35 a couple of weeks ago, as I had to install mIRC at a second computer while I was reinstalling my first computer.
Haven't tried it under 7.x yet, though. Policy might have changed.
