The mIRc instal File Appear to be damaged please Try again running The mirc installer again or download a new version.

That message appear Now Tell Me what i Do i think i Try 200 times When i try to INSTAL That Message appear

Try downloading from a different mirror

also be sure that when you install mIRC that nothing else is running in the background.

in the event the install is freezing when you get to the end and urls.ini part, see this thread