Rename the DYOMx.dat into DYOM1, DYOM2, etc, and place that file in your GTA San Andreas User Files.

HIGHLY RECOMMENDED: Place the folder inside the RAR's SD file in your GTA San Andreas User Files/SD or SD folder.
If you still don't know how, there is always an internet that will help you.

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FACT:
This mission took me 3 days to finish due to bugs, glitches and errors.
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A bug that might happen: During the drive by, the car you are in can be stucked because of police cars, cars, 
trucks, etc pushing you to a corner of something, and that will make the car stuck. Just replay the mission.
The frame limiter is maybe the reason.
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Thanks for downloading :)