You have been disconnected. (BLZ51901017)
Information on error BLZBNTAGT00000907
Standalone patches are downloaded outside of the game launcher or the Blizzard Battle.net desktop app.
If you do not have a decryption key, check the installation instructions for a point of contact.
How to resolve error BLZBNTBNA000000C8
Troubleshooting steps for Diablo II (2000) error "Your CD Key is currently being used by: Claimed on Battle.net."
How to resolve this issue when installing or updating a game
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The login servers received invalid information