Roblox Error Code 280: Upgrade Required Fix

Error 280 appears when your Roblox client is too old for the game you're trying to join.

Fix Steps

1. Close Roblox completely.
2. Delete the Versions folder inside:

%localappdata%\Roblox

3. Restart your PC.
4. Download the latest Roblox installer from the official site.
5. Reinstall and try again.

Make sure your system date & time are correct — wrong time can break certificates.