Error code

Steam 54

STEAM54
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

A game download or update stops with "Not enough disk space (Error Code: 54)"..

How to fix it

  1. Free up disk space on the target drive.
  2. Change the Steam download folder to a drive with sufficient space in Steam > Settings > Storage.
  3. Clear the Steam download cache.
  4. Verify game files after freeing space.

Not affiliated with Steam. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.