Older games are purely singleplayer, multi is something they leaned on later on. For PC Rayman Legends also supports local co-op, I believe. This one however is only available on Steam and requires Uplay account or linking your Steam to it. Origins is available on both Steam and GOG - I can confirm the latter version does not require any additional accounts or services.

Finally, there’s Rayman Raving Rabbids but that’s more of a mini-game compilation/party game rather than a platformer. It also has multiplayer.