Hello all fellow Sven-Co-op players and such

anyhow...we have a sort of problem my friend and I are attempting to play svens-co-op now the problem is my friends client for Sven-co-op launches it as Half-Life 1 starting screen instead of Svens-Co-op

Now he Installed it exactly like me and Sven is working perfectly fine for myself so if anyone knows what the problem is please respond.