This tool acts as a bridge for users whose devices have not yet received the latest major version of Windows 10 through the standard Windows Update settings. It is particularly useful for resolving issues where the automatic update process has stalled or failed. Windows Update Assistant - Microsoft Support

The is a native Microsoft tool designed to help users manually download and install the latest feature updates for Windows 10. While standard "quality updates" (security patches and small fixes) usually occur automatically in the background, larger "feature updates" that introduce new capabilities are often rolled out in stages. The Update Assistant allows you to bypass these staggered rollouts and upgrade your system immediately. What is the Windows 10 Update Assistant?