Download the repo located in current-modlist in our discord
In the ARMA 3 launcher, unload all your mods

Under the 'Presets' drop down, click on 'Import' at the bottom and select the HTML file you just downloaded


Once you select the file you wish to upload, the launcher will start downloading
Load Global Mobilization and S.O.G. Prairie Fire in the DLCs tab

Install and load the CDLC Compatibility mods if you need them
Only do this step if you do not own one or both of the CDLCs that are required

Note: In step 3, importing will download the mods and load them, where as dragging the file in will just download them.
DO NOT USE LAUNCHER SERVER BROWSER. USE IN GAME SERVER BROWSER