I've had a hankering for this game recently so I started looking for a torrent of it (I'm not sure what ended up happening to my CDs)

I looked around for the PC version (not wanting an emulator) and eventually found what I hope I was looking for. A nice torrent around 2.1gb for all 5 disks (install disk +other 4) merged into 1 ISO file. I mount it onto Daemon tools lite and the install window pops up...

I click "install" and...nothing happens (except the little hourglass beside the cursor for a few seconds)

what do you think I'm missing? (have I given enough info?)