THIS VERSION IS OBSOLETE and it uses Mapbase v3.0.1.
1) Install Source SDK Base 2013 Singleplayer and set beta version to -upcoming.
- Open TOOLS in your Steam Library;
- Find Source SDK Base 2013 Singleplayer and install;
- Open Properties.../BETAS and set the branch to -upcoming;
2) If you don't have Mapbase installed yet, extract all the files to your "steam/steamapps/sourcemods" folder.
If you already have Mapbase installed, extract only "rebelsurge" folder to "sourcemods".
3) Restart Steam.
Now you're supposed to have Rebel Surge in your Steam Library.
You can also download it from Google Drive