Once you've downloaded the Pack, extract the "Act I" folder to any place of your choice. Then you can pick any of the Mission Folders and select their DYOM.DAT. Extract the DYOM.DAT to your MPACK directory(usually in Documents)
Okay, I finished all of the missions. I must say, they are well thought out and offer some good action and fun. But my main problem with the missions is the mechanics. Like in 'The Hornet's Nest', I ran into the building without killing anyone outside, so when I had to 'fight your way through the market' I found myself unable to complete the objective because there were soldiers outside in LV that I didn't kill, and I could not go back. you need to use the Hide tool more often to prevent this. And also, in some missions, you need pedestrians and traffic disabled because with all the action the DYOM is putting in, having peds walking around is not only unrealistic but also makes the game lag and sometimes crash.
gabrielgx to install DYOM you put MPACK into GTA San Andreas User Files, which is found in My Documents.
You then put the DYOM mission files that come with this mod in GTA San Andreas User Files.
You must have Cleo installed too
When you run GTA, click start game, new game, and then choose Design Your Own Mission. When CJ spawns, press Y and load up the mission file of your choice