Download and Install the Design Your Own Mission Mod (DYOM) to play!  
Name the DYOM "DAT" file with:

DYOM1.DAT
DYOM2.DAT
DYOM3.DAT
DYOM4.DAT
DYOM5.DAT
DYOM6.DAT
DYOM7.DAT
DYOM8.DAT

Place it on your GTA San Andreas User File (Usually in My Documents). Start the game, Open DYOM, Load the Mission. Done!

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AAP1295