Solution here.Lass.exe appears once the installer is run, even if it did not complete it's installing mIRC. For me, there is an error message telling me there's an error caused by mIRC614 is an MSVCR or something similar.
Restarting the computer, there will be the message that LASS caused an error in ws2_32.dll.
Btw, I had downloaded from these Singapore mirrors, which are listed in
http://www.mirc.com/get.htmlhttp://mirc.wonderchat.com/mirc614.exehttp://mirc.rapidity.org/mirc614.exe