The file
http://mirc.wonderchat.com/mirc614.exe is not a valid mIRC installation file, it is nowhere near the size of a real version of the install file.
The .exe file contains this text: " -=þ PE-SHiELD v0.25 -þ- (C) Copyright 1998-2000 by ANAKiN [DaVinci] þ=- ", a program I have never heard of before. The download has either been virused or overwritten with another program.
I couldn't DNS mirc.rapidity.org.