These are different from the skins that you see released by skinners and meshers. These are specifically designed as alternates to the character in question. Each of these downloads includes
a) the skin in question
b) an hud_head for the skin
c) packages set up for you
Installing is very easy. First, unzip the rar to your MUA directory. Then, if you want
to replace Iron Man's 3rd armor with his Heroes Return armor (for example), simply change this portion of his herostat:
skin_03 = 03 ;
skin_03_name = War Machine ;
into this:
skin_03 = 07 ;
skin_03_name = Heroes Return ;
You can also add these costumes in the fifth and sixth slots (see below), but keep in mind they will get no passives if you do so. Either way, I hope these simple packages are user-friendly (I tried to make them be

)
To
add skins to a hero, find your hero's entry in the herostat, then add these lines below skin_04_name
skin_05 = 05 ;
skin_05_name = Mark IV ;
skin_06 = 06 ;
skin_06_name = Stealth ;
Note: Check
The Official Skin Image Gallery for larger images of these skins.
Credits:
darkmythology - Spider Armor Spider-Man, White Phoenix Jean Grey and X-Men Deadpool skins
iammingy - Flexi-Armor & Stealth Iron Man skins; New X-Men Wolverine mesh/skin; Modern (Jacket) Wolverine mesh/skin; Spider-Man Unlimited skin; Photon skin; X-Men Iceman Skin, hud; Retro Human Torch skin, hud; Strange Doctor Strange skin, hud; Venom (classic bulky black) skin
Noelemahc - Classic Luke Cage skin
Norrin Radd - Weapon X Sabretooth skin, Civilian Wolverine skin, Civilian Cyclops skin
thetommyboy2002 - World War Hulk, Amazing Bag-Man and Golden Archer meshes
TomatoisJP - Retro Wolverine skin
Crowley - Spider-Man 2099 skin, hud
Parrastaka - Spider-Man 2099 skin
BLaw - Retro Cyclops skin, hud; Modern Captain America skin, hud; Ben Reilly skin, hud; X-Force Wolverine skin, hud; Ultimate Bishop skin, hud; Retro Gabit skin, hud; Retro Iceman skin
Venom - Spider-Man 2099, Retro Cyclops, Modern Captain America pkgb files
matt710 - Outback & Acolyte Colossus skins, Madelyne Pryor & Black Queen Jean Grey skins
shafcrawler - Nightcrawler Priest and Uncanny skins
apollo - Nightcrawler Warpies skin
nodoubt_jr - Nightcrawler Ultimate (red suit) skin conversion
Dark_Mark - Venom models/Marvel VS Capcom skin
Teancum - Civilian Wolverine, Civilian Cyclops, Ultimate Storm (Spiky Hair/Ponytail), Ultimate Colossus (Human), Outback Colossus, Stealth Iron Man, Amazing Bag-Man, Spider-Man Unlimited, Photon, & all Nightcrawler huds, Venom (classic bulky black) hud, Venom Ultimate (spider logo) skin (based on Iammingy/DLC skin), Venom Nemesis/Marvel VS Capcom hud & skins (based on Iammingy's/DLC)
0306 / Wolverine (Age of Apocalypse)
 | 0307 / Wolverine (Retro)
 | 0308 / Wolverine (New X-Men)
 | 0309 / Wolverine (Modern) *Jacket*
 |
| 0310 / Wolverine (X-Force)
 | 0311 / Wolverine (Civilian)
 | 0312 / Wolverine (Gladiator)
 |
| 0322 / Wolverine (Street Gear)
 | 0323 / Wolverine (X-Men Legends)
 | 0325 / Wolverine (Weapon X)
 |
0405 / Storm (Age of Apocalypse)
 | 0406 / Storm (Ultimate) *Spiky Hair*
 | 0407 / Storm (Ultimate) *Ponytail*
 | 0421 / Storm (Original)
 |
| 0422 / Storm (Street Gear)
 | 0423 / Storm (X-Men Legends)
 |
0505 / Thing (Dark)
 |
0705 / Captain America (Dark)
 | 0708 / Captain America (Modern)
 |
0806 / Iceman (X-Men)
 | 0808 / Iceman (Retro)
 | 0810 / Iceman (Ultimate) *Human*
 |
0905 / Spider-Man (Dark)
 | 0906 / Spider-Man (Spider Armor)
 | 0907 / Spider-Man (2099)
 | 0908 / Spider-Man (Ben Reilly)
 |
| 0909 / Spider-Man (Amazing Bag-Man)
 | 0910 / Spider-Man (Unlimited)
 |
1306 / Human Torch (Fiery)

StatEffect { bolt = Bip01 Spine1 ; effect = char/humant/special_flameon ; fxlevel = 2 ; skin = 0X ; } | 1307 / Human Torch (Retro)
 |
1507 / Iron Man (Heroes Return)
 | 1508 / Iron Man (Flexi-Armor)
 | 1509 / Iron Man (Stealth)
 | 1510 / Iron Man (Dark)
 |
1605 / Doctor Strange (Strange)
 |
1705 / Deadpool (Age of Apocalypse)
 | 1706 / Deadpool (X-Men)
 |
2005 / Mister Fantastic (Dark)
 |
2205 / Invisible Woman (Dark)
 |
3005 / Psylocke (Dark)
 | 3007 / Psylocke (X-Men Legends)
 |
4706 / Nightcrawler (Priest)
 | 4707 / Nightcrawler (Uncanny)
 | 4708 / Nightcrawler (Ultimate) *Red*
 | 4709 / Nightcrawler (Warpies)
 |
| 4711 / Nightcrawler (X-Men Legends)
 |
7805 / Colossus (Age of Apocalypse)
 | 7806 / Colossus (Acolyte)
 | 7807 / Colossus (Outback)
 | 7808 / Colossus (Ultimate) *Human*
 |
| 7809 / Colossus (X-Men Legends)
 | 7810 / Colossus (Gladiator)
 | 7811 / Colossus (Dark)
 |
12306 / Jean Grey (Dark Phoenix)
 | 12307 / Jean Grey (White Phoenix)
 | 12308 / Jean Grey (Age of Apocalypse)
 | 12309 / Jean Grey (Black Queen)
 |
| 12310 / Jean Grey (Madelyne Pryor)
 | 12316 / Jean Grey (Ultimate) *Short Hair*
 |
15705 / Luke Cage (Classic)
 |
17005 / Hulk (World War Hulk)
 |
17105 / Hawkeye (Golden Archer)
 |
17205 / Cyclops (Age of Apocalypse)
 | 17206 / Cyclops (Retro)
 | 17207 / Cyclops (Civilian)
 | 17208 / Cyclops (Street Gear)
 |
| 17209 / Cyclops (Gladiator)
 | 17210 / Cyclops (Dark)
 | 17211 / Cyclops (X-Men Legends)
 |
17305 / Captain Marvel (Photon)
 |
17505 / Magneto (Age of Apocalypse)
 |
17605 / Venom (Marvel VS Capcom)
 | 17606 / Venom (Ultimate) *Spider Logo*
 | 17607 / Venom (Classic) *Bulky Black*
 | 17608 / Venom (Nemesis)
 |
17705 / Sabretooth (Weapon X)
 |
19006 / Beast (X-Men Legends)
 |
19605 / Blob (Gladiator)
 |
20605 / Bishop (Ultimate)
 |
20905 / Toad (Ultimate) *Brown*
 |
21205 / Gambit (Retro)
 | 21207 / Gambit (X-Men Legends)
 |
21305 / Magma (X-Men Legends)
 |
21605 / Pyro (Gladiator)
 |