This mod is an addon to 2 Player Deluxe which implements the downed & reviving mechanics found on games such as PAYDAY, Left 4 Dead, Saints Row, etc to GTA San Andreas.
It includes a highly configurable .ini file to let players tailor the mod to their taste.

Features: (These are the default settings, you may adjust or enable/disable each of these in the configuration file)
- The player that reaches 0 HP will enter a downed state before they die, in which the other player will have to assist by approaching the downed player and pressing or holding L1/LB to help them up.
- The helping player will have 30 seconds to revive the downed player before they bleed out.
- The downed player that has been revived will receive 40 HP.
- Each consecutive downs will shorten the revive timer by 5 seconds. 
- A player that has been downed 3 times will immediately die upon their next down.
- Gaining full health (picking up a health pickup, eating food, etc) will reset the downed counter to 0.
- After a player bleeds out, the other player may continue on their own. (Disabled by default)

Installation Guide:
Method 1 - Modloader (Recommended): Copy the "2 Player Revive" folder into your "modloader" folder.
Method 2 - Direct Install: Copy the files inside the "2 Player Revive" folder into your GTA San Andreas root folder.

Note: This mod still has room for improvement, so please leave your suggestions in the comments section!
I might also implement a cuffed mechanic where a player that gets busted will have to be rescued by another player.