But you may find Windows Update stuck downloading updates and get stuck at some point. The Windows Update will automatically download the latest available updates for your computer. Situation 2: Windows 10 update progress bar is stuck Situation 1: Windows 10 Upgrade Assistant stuckĭuring the downloading and installing process, you may find it suddenly stuck with error code, such as, 0, 3, 35, 48, 81, 99, etc. Besides, you may receive error message like “Windows 10 upgrade stuck at checking for updates”, “ Windows 10 upgrade stuck on checking your PC”, “Windows update stuck installing”, “Windows 10 update stuck restarting” and so on. And this situation may last for hours. Thus, there are 3 situations you will receive this error. However, you still need to upgrade drivers, service packs on Windows 10 with Windows Update. When it comes to Windows 10 upgrade stuck error, you may only think about upgrading Windows 7/8/8.1 to Windows 10 with Upgrade Assistant. What to do after Windows 10 Upgrade stuck issue fixed?.How to fix Windows 10 upgrade stuck effectively.