Installing G-Senjou no Maou 18+ DLC

1. Go to G-Senjou no Maou in Steam, right click on Properties, then Local Files, then Browse Local Files. 

2. Your folder should look like this:

3. Open the downloaded archive in 7-zip (if you do not have 7-zip, it is available here: https://www.7-zip.org/ )

4. Click the folder in the archive labeled 'G-senjou no Maou 18+ DLC'

5. Copy the 'patch2.xp3' over to the game folder as the readme indicates

6. Your folder should look like this:

7. The install is done!