Many modes are created based on SAMPFUNCS and without it they do not work.
If a mode asks you for SAMPFUNCS, download it below.
CAREFUL:
SAMPFUNCS is compatible with SAMP R1, with SAMP R2 you will crash.
SAMPFUNCS runs only with CLEO installed in the game.
Install SAMPFUNCS:
copy the downloaded SAMPFUNCS.asi file to the GTA San Andreas game folder.
Some modes do not work properly with the latest version of sampfuncs below (eg CopCmd mode).