To install, place the US MARINS folder into: Disk:\DCS World OpenBeta\Bazar\Liveries\mi-8mt or into your C:\Users\User\Saved Games\DCS.openbeta\Liveries\mi-8mt folder, if you don't have one create one. thank you.
Video link here :
https://youtu.be/08k1t2w6Wew