You might be encountering a 405 Method Not Allowed HTTP error while trying to download a .rar file, meaning the server doesn't allow the specific action (like a POST request) you're using to access the file.
This specific phrasing is often associated with spam emails or malicious links where users are prompted to download a compressed file ( 405.rar ) that likely contains malware or ransomware.
Could you clarify if you are on a website you manage, or if you received a suspicious message with this subject line?
The query could refer to a few different things: