Because these files are created by modders, they are hosted on community forums or social media. Look for recent updates to ensure compatibility:
For files, move them to the download folder of your game directory and use a DPFilelist Generator to activate them.
For mods, place the folder in your livecpk directory and add the corresponding line to your sider.ini file. Save Data/Squads:
Restart your game and check the player's appearance or stats. If you are using a face pack, ensure the matches the one used by the mod creator.