Run the upgrade with the Installation Assistant or setup.exe and read the “What needs your attention” screen. Uninstall the app it names (often third-party antivirus), restart, and run the upgrade again.

What 0xC1900208 actually means

0xC1900208 is a compatibility block. Setup lists the blocking app before upgrading. Removing it, and reinstalling a compatible version later, clears the block.

Signs of the problem

  • “0xC1900208 – 0x4000C” during upgrade.
  • Setup says an app needs your attention.

Why 0xC1900208 happens

  • Incompatible antivirus, VPN, disk or system utilities.

Fixes to try, in order

  1. Identify the appRun setup from the Installation Assistant or a mounted ISO and note the app listed under What needs your attention.
  2. Uninstall itSettings → Apps; use the vendor's removal tool for antivirus.
  3. Restart and upgradeRun setup again, keeping files and apps.
  4. Reinstall laterInstall the latest compatible version of the app afterwards.
How to confirm the fix: The upgrade completes and winver shows the new version.

Prevent it from coming back

Keep utilities updated before major upgrades.