Search for "Cleo 4.1.3" (this is the direct successor to 1.0.12) or the specific legacy archive "cleo_1.0.12_setup.exe". Always use official sources or trusted mod databases.
Cleo Mod Master Version 1.0.12: The Essential Modding Companion for GTA San Andreas Cleo Mod Master Version 1.0.12
Just don't be surprised if, while driving through the digital desert at midnight, the radio plays a station you didn't install, and the pedestrians start to look a little too much like you. Search for "Cleo 4