Please stop the game before patching, if it is running in the background!

Click the button and select the root folder of your Anno 2070 installation. Thats the folder containing Anno5.exe. Usally it is located at C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\games\Anno 2070 or C:\Program Files (x86)\steamapps\common\Anno 2070

Apply modifications to your local game installation. The first time patching can take a bit longer as backups will be created.

Remove all modifications and revert to a vanilla installation. If it fails you can try to verify files in the launcher you installed the game with.