This version of the mod should be fully playable in single player skirmish mode. There are currently two factions playable, Kelreich and Suvia, and the game still uses maps from the original BFME, though the map creeps have been altered to fit with Age of Strife's world. To install Age of Strife simply download it and open the zip file (not inside your BFME directory, that'll cause problems), then follow the instructions provided in the text document Setup Instructions
Just to confirm, you do not need this version of Age of Strife to play later versions, if you wish to play this mod I would advise downloading the most up to date version instead. Just go to files and select the most recent update, this version is mostly just being left up for anyone who is having trouble playing later versions.