there is a torrent called mechwarrior4mercenaries.all.to.51.03.01.0017.mtx.torrent that you will need to launch in the Bit Torrent client of your choice (Vuze/Azureus, etc.)
Once the torrent is downloaded, copy the .mtx file to
c:\Program Files (x86)\mektek.net\MTX\temp\Games
Launch MTX, and select Mercenaries, install. It'll churn for 3-5 minutes. Then you have to repeat the process with the ".0017 to .0018 update" (DL the torrent, then replace the MTX file in /games, then let the update install).
At this point you SHOULD have the install the MekTek wants you to have for playing.
OR ... you could just wait till they release a stand-alone executable later this weekend.
BTW, the reason they went thru all this foolishness with the downloader and verifer is that they REALLY love tournament/league multiplayer. The old Mechwarrior leagues had a problem with balkanization due to folks playing with different versions/mods. MekTek thinks they can control this problem by making everyone play thru their verifier/updater.
I've had MTX for a while now and yes it does run slow but the problem I'm having is that the .EXE for mechwarrior Mercs is found by Norton Endpoint as a Trojan so now i cant play it anymore but it's still taking up space on my computer ...... nice huh?