Hello Zeiken22
Yes, you cannot play SA:MP with Any other version other than v1.0
However, we here at Argonath have a Downgrader patch, just for that cause

Visit
>This Link here< To get the No-CD Patch that also downgrades your game back to v1.0
Hayden, how do i install that?Well, you open your GTA SA folder
Usually at C:/Program Files/Rockstar Games/GTA San Andreas
go there, and take the gta_sa.exe you just downloaded and
Replace the original gta_sa.exe
Any Problems, come back here.
-EMRU ~ Hayden