my a survival game server has been rock solid for months... then teh latest patch arrived and it died. steamCMD output:

Windows Update
We couldn't complete the updates.
Undoing changes. Don't turn off your computer.
Error code: 0x800f0922
Clients say version mismatch. Id love to fix this without wiping the world save.
Most important to me is keeping teh world save intact. If theres a safe order of steps, Id love to follow it exactly. Any help before the weekend rush would be fantastic.