To install via SD card - download zip file - extract folders (PS4/OldBoy/Zelda) from zip file to your external sd card - use Command app on RS-97 to copy folders from sd card to /mnt/game/gmenu2x/skins/ - go to Settings > Skin, use left/right to select skin and confirm with start - go to Settings > Wallpaper, find the wallpaper you like the most
Thanks goes to m1024 Dingoonity
https://www.file-upload.net/en/download-13026686/skin-pack-v5-m1024.zip.html