MiG-21MF 7701 Delta aerobatic team.
unzip the file and put the unzipped folder [MiG-21MF 7701] to:
...\DCS World\CoreMods\aircraft\MiG-21BIS\Liveries\MiG-21Bis\...
it should look like> \DCS World\CoreMods\aircraft\MiG-21BIS\Liveries\MiG-21Bis\MiG-21MF 7701\...here are the skin files .dds