NOTE: create a backup file of the source mod before you overwrite it.
Various mods were used here including 39Gamer39's Portal 2 SkinPack and Thunder Skunk's Wheatley Cores: https://www.moddb.com/mods/portal-2-s...
STAND-ALONE VERSIONS:
https://www.playground.ru/portal/file...
https://gamebanana.com/mods/234951

Game download: http://www.portalprelude.com/
Patch download: https://www.moddb.com/mods/portal-pre...

Portal ~ Valve