Yes. You will have to wait for the timer to finish before you can use it each time you start it up, but you don't have to register to keep using it. However, if you think mIRC is a great program, then you really should register it. It helps to keep the updates coming. Remember that this is how Khaled pays the bills. And it's not much money for a program where you get all future versions free.
#Invision on irc.irchighway.net