The double dash - -.rar might be a placeholder or typo. Could be a poorly named file for an album or single (e.g., “Ed Sheeran - - (something).rar” ). No official Ed Sheeran release has that exact naming.
First, a technical primer. A .rar file (Roshal ARchive) is a compressed folder, similar to a .zip file. Musicians and leakers use .rar to bundle entire albums, demo collections, or soundboard recordings into one downloadable chunk. Ed Sheeran - -.rar