If the progress of Windows 11 Installation Assistant or Windows 10 Upgrade Assistant is stuck at 99% for more than four hours, here’s something you can try.
![windows 11 installation assistant hangs at 99%](png/install-assistant-99-percent.png)
Resolution
Option 1
Make sure you follow these steps before you restart your PC. Otherwise, the Media folder might be unavailable.
- Open File Explorer, type C:\$GetCurrent, and then press Enter.
- Copy and paste the Media folder to the desktop. If you don’t see the folder, select View and make sure the check box next to Hidden items is selected.
- Restart your PC, open File Explorer, type C:\$GetCurrent in the address bar, and then press Enter.
- Copy and paste the Media folder from the desktop to C:\$GetCurrent.
- Open the Media folder and double-click Setup.
- Follow the instructions to start the upgrade. On the Get important updates screen, select “Not right now” or “Not at the moment”, and then select Next.
- Follow the instructions to finish installing Windows 10/11.
- After you’re done, make sure to install available updates. Select the Start button, and then select Settings > Update & Security > Windows Update > Check for updates.
Option 2
Use the Windows 10/11 ISO or USB setup disk to install Windows.
- Download the Windows 10/11 ISO.
- Double-click the downloaded ISO to mount it to a drive-letter.
- Run Setup.exe from the mounted ISO drive-letter.
- In the initial screen, click “Change how Setup downloads updates”
- Select “Not right now” or “Not at the moment”, and click Next.
- Follow the instructions to finish installing Windows 10/11.
- After you’re done, make sure to install available updates. Select the Start button, and then select Settings > Update & Security > Windows Update > Check for updates.
(Also, see Windows 10/11 Upgrade Stuck at Checking for Updates and Windows 11 Installation Assistant Error 0xc00000f0)
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