I tried to reinstall mIRC after not having it on this PC forever, and my key didn't work. I got it in 2010. It was just $14 to get another one and, ya know - fine. In fact, I think "the key is good for 10 years" or 15 years ought to be a thing. Something between subscription, a year, a three-year deal and then lifetime. I am now a proponent of 10 year licenses for apps. (But for digitally purchased games, I got a backlog over here.)