In this folder, you still can see a regular Windows installation package.
 
 

Update to Windows 10 version stuck at 99% – Microsoft Community

 
This is the easiest solution to fix the Windows update stuck in the middle. In this, you need to forcefully restart your system and check for the updates again. How to Fix Windows 10 Update Download Stuck at 99 or % · Launch Windows 10 Settings. Choose Update and Security group · Launch the File. Windows 10 Upgrade Assistant is stuck at 99% · Open File Explorer, type C:\$GetCurrent, and then press Enter. · Copy and paste the Media folder to the desktop.