Solution 1: Run Setup from the Media Folder.Tip: Back up Your Computer before Performing a Windows Update.Windows 10/11 Update Assistant Is Stuck at 99%! How to Fix It?.What Is Windows 10/11 Update Assistant?.When your Windows 10 Update Assistant is stuck at 99% or the Windows 11 Installation Assistant is stuck at 99% forever, do you know how to fix the issue? In this article, MiniTool Software will show you some easy solutions that have proven effective.
