on this site has the link to the mod itself once there here are the steps you must take to install.
1) Installed an older version in mods folder, if named SCTABalance-master and/or SCTA-master delete it
2) Download the Zip from Github to Desktops or wherever,
3) Unzip the Zip to Mods folder. Document Path is "documents/mygames/gas poweredgames/supremecommanderforgedalliance/mods"
4) Then once launched you have if launched via FAF Client on mod screen to option to choose SCTA. pick that one.
5) Once in Lobby you can then enable SCTA Rebalance. If you want to play TA Factions as close to original TA in terms of economy and otherwise as possible just have SCTA enabled. If you wish to play this project as intended (versus one of the 4 Supreme Commander Factions) enable SCTA Rebalance. Then Launch!
6) To play with TAShaders the game must be launched as a Nomad one. Then in addition to enabling SCTABalance you must also enable TAShaders.
If you have issues its likely the following
1) Did not Delete An Old Version
2) Unzip to SCTA itself then move folder to Mod resulted in a nestled folder
3) You download zip to mod folder resulting in it reading the zip