: Updates can occasionally "break" the link to installed content, requiring a file verification. Steam Sync Errors
Items colored in are active; those that are are either not installed or not owned on that specific account. 3. Save Game Dependencies (The "Continue Anyway" Choice)
Have a different error? Let us know in the comments if you see "Save file corrupted" or "Incompatible game version."
: Steam might fail to download or sync specific DLC files even if they are listed in your library.