Since it was apparently deleted off of the files.halomods server, I've uploaded the AOTCR Halo 2 mod on my own server:
http://www.rowdyworks.com/Alxs/AlxHalo2Aotcr.zip
I have modded Assault On the Control Room and Blood Gulch so the weapons and vehicles are Halo2-like.
UPDATE (April 24 2004)
AOTCR mod is now much better.
download here:
http://files.halomods.com/viewtopic.php ... sc&start=0
UPDATE!: (01/26/04)
I have made the mod for bloodgulch alot better, with new models, skins, sounds, and more. There are now human turrets(thanks to dankbutter for telling me how to do turrets), and the purple covie rifle (i named it the laserburst) and battle rifle have been remodeled (battle rifle model and skin courtesy of beastman). also there have been many little changes here and there to make the mod better, including new targeting reticles, just about every weapon/vehicle has new crosshairs, except for a couple. The scorpion tank is now the covenant troop carrier that was seen on the e3 demo, and the fuel rod gun is now the brute's gun. Also, i have made a new model for the SMG. plus the gauss warthog's projectile must actually hit the target, it has no splash damage.
The assault on the control room mod is still the old one, but i will update that one soon.
also coming to other maps!

You can download it here:
Assault on the control room:
http://files.halomods.com/viewtopic.php ... sc&start=0
Blood Gulch:
www.rowdyworks.com/Alxs/Halo2BG.zip
Things that have been changed
Battle rifle
The assault rifle is the battle rifle, it has a lower rate of fire, more powerful, 25 round magazine, and 3x scope.
SMG
The pistol is the SMG. It has the same accuracy as the plasma rifle, very high rate of fire, and a 100 round clip.
Covenant Rifle
The sniper rifle is now the long purple covenant weapon seen Here. It is very similar in behavior to the Battle Rifle. Elites now carry Covenant Rifles instead of Plasma Rifles.
Guass Gun Warthog
The Warthog's LAAG is now the guass gun, it fires explosive shells at very high velocity.
Covenant Seige Turret
Shade turrets are now Siege Turrets. They fire a projectile similar to a Wraith mortar, only much more devastating.
Other Stuff
Covenant vehicles explode blue like on the e3 demo, ghosts have a higher rate of fire and accuracy, and fuel rods explode blue like the Brutes' guns.
I think that's it.