Windows Update Windows Update

0x800f0922: the update couldn't finish installing

Likely causes

• A VPN connection is active during the update.
• Not enough free space in the System Reserved partition.
• On Windows Server 2016, updates rolled back because license token files couldn't be updated (permissions on C:\Windows\System32\spp).

How to fix it

1. Disconnect from any VPN and turn off the VPN software, then try the update again.
2. Check that the device can reach the internet and the Windows Update service (no proxy or firewall block).
3. If it still fails, the System Reserved partition may be full. Enlarging it needs partitioning tools and a backup, so hand it to an admin.
4. Windows Server 2016 admins: check %windir%\Logs\CBS\CBS.log. If license token updates failed, Microsoft’s fix is giving the User and Network Service accounts write permission on C:\Windows\System32\spp\.

Checked against: support.microsoft.com, learn.microsoft.com