Please I need to know so I don't need to downgrade the game.
Clean vicecity with no modifications and the latest version.
How do you think about the steam version ?
I believe it's 1.0
Just try to play, if it works continue. You will know if the version of the game you own is not compatible with VC: MP.
Maybe this could help you, read the description: https://www.moddb.com/mods/vice-city-multiplayer/downloads/vice-city-multiplayer-04-client
A clean unmodified game is recommended or else you'll likely be banned from servers if you are showing signs of a non default game, and gta-vc.exe version 1.0
Most people using Steam version