Move the extracted contents into your Elden Ring Game folder (typically .../SteamApps/common/ELDEN RING/Game ). Make sure to back up your save files first! Link to Download/Nexus Mods Option 2: Technical/Troubleshooting (e.g., Reddit or Forum)
Since "elden.7z" typically refers to a compressed archive for modifications (mods) or DLC-related files, here are three draft options based on the common reasons you might be sharing this file.
If you are the one receiving this file, remember that .7z is a high-compression format. You will need the 7-Zip utility or Windows 11's native support to open it.
Use this if you are providing specific "clean" files or patches for the DLC.