Install the folder where DCS is installed in :
 \ Eagle Dynamics \ DCS World 1.5 OPENBETA \ Mods \ aircraft \ M- 2000C \ Liveries \ M- 2000C

Skins are freeware , free and freely distributable . Its preparation requires time and effort ;
so if you like it and you think you deserve, you can make a donation to the account of paypal skincreatordcs@gmail.com
