Could shadowoftheerdtree.7z.004 be a legitimate standalone file? Possibly, but rarely. Some backup software (like WinRAR's "Split to volumes" or MacOS's split command) uses numerical suffixes. However, the .7z middle extension proves it is a 7-Zip segment.
If you genuinely have only the .004 file and cannot find the others, all hope is not lost: shadowoftheerdtree.7z.004
Cause: The .004 file is corrupt, incomplete, or flagged by antivirus. Could shadowoftheerdtree
Fix:
If you have shadowoftheerdtree.7z.004, you must have the other pieces of the puzzle. Check your download folder for the following sequence: Crucial Warning: If you are missing any of
Crucial Warning: If you are missing any of these sequential files, you cannot extract the game. The archive is a chain; a single missing link breaks the whole system.