0xC1900208 — an incompatible application is blocking the upgrade
Setup's compatibility scan found something it will not upgrade past — usually an old antivirus, a disk encryption product, or a driver-level utility.
What you see
A feature update refuses to start, or Setup stops at the compatibility screen with 0xC1900208. Nothing is broken; setup is declining to proceed.
What is actually wrong
A hard compatibility block. Setup keeps a list, and the scan result names the application, but the Windows Update UI does not show you the name.
Codes and articles
Start here — find out which fix applies
A script that runs the 2 inspection commands from the write-up below and prints what each one returned. It reads the machine and changes nothing — every command that could write, delete, start or stop is excluded from it by construction. Run this first, then pick the fix its output points at.
No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.
The fix
Read the compatibility report and clear the blocker
The upgrade will not start. Find the blocker before uninstalling anything on suspicion.
Run the compatibility scan on its own from mounted media — it writes a report without attempting the upgrade.
D:\setup.exe /Auto Upgrade /Compat ScanOnly /MigrateDrivers All /DynamicUpdate Disable /copylogs C:\temp\compatScanOnly is the whole point: it produces the same verdict as a real attempt in a few minutes and cannot leave the machine half-upgraded.
Read the result. The blocker is named in the setup logs it copied out.
Select-String -Path C:\temp\compat\*.xml, C:\temp\compat\*\*.log -Pattern 'BlockingApplication|CompatBlock|HardBlock' | Select-Object -First 20Also check the panther log, which records the same decision in plain text.
Select-String -Path C:\`$WINDOWS.~BT\Sources\Panther\setupact.log -Pattern 'CONX|Block' | Select-Object -Last 30Uninstall the named application with the vendor's own removal tool. For disk encryption, decrypt the volume first — do not simply uninstall it.
Removing an encryption driver while the volume is still encrypted leaves data that nothing on the machine can read.
Retry the upgrade from mounted media rather than Windows Update.
No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.
Related faults
Where this stops. This write-up was written and checked by hand. It says what each step changes, how to confirm it worked and how to reverse it, and anything destructive is flagged before you reach it. If it does not match what your machine is doing, search the Support Centre for the exact code or message — and when something needs a person, get in touch.