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Client

Install the game ArmA 3
The Epoch Chernarus (All In Arm Terrain Packlite) modification OA-terrains-from-BI-in-A3 here.
Unpack the archive (AllInArmaTerrainPackLite_xxxx_xx_xx.7z)
Copy the folder @AllInArmaTerrainPackLite and paste it into the main directory of ArmA 3.
directory: ... \Steam\SteamApps\common\Arma 3
Open Steam
Right click on the game "Arma 3" and the option Properties
Click the "START OPTIONS ..." button
Insert the following in the input field: -mod = @ AllInArmaTerrainPackLite; @Epoch
Confirm with OK
Start the game and have fun;)

Installation Procedure for Arma 3 Epoch Chernarus