Clan Coyote, Cmeg, and friends have compiled a list of tips and tricks to address the issues some pilots have been having getting Mechwarrior 4: Mercenaries to run smoothly on today's modern-day operating systems!
While it's not an exhaustive list, it may at least point people in the right direction to get the ball rolling on resolving some of the more common graphics problems.
Any further problems can be addressed by visiting Clan Coyote at their home page, or by contacting Cmeg himself.
Wrench-and-Screwdriver Icon: Flaticon.com
It seems that after eight months, twelve file updates, and over 4,000 downloads, ModDB "is not permitted to distribute Mechwarrior 4: Mercenaries or any associated mech pack." Therefore, the main game client has been removed.
We will continue making updates here. But as for executing tech support and hosting the server and all files required to interact with the server, you'll have to go through Clan Coyote.
I encourage you to visit them!