Microsoft has released Cumulative Update for Windows 10 version 1607 (KB3189866) and is available for download via the Window Update. For some, the update download was stuck at some figure. Instead of relying on Windows Update, you can visit Microsoft Update Catalog site in Internet Explorer, search for that Update, download and install on your computer without wasting time, here is how that can be done.
Fix Windows 10 Cumulative Update KB3189866 download stuck
1. Open Run dialog and type iexplore.exe to open Internet Explorer.
2. Visit Microsoft Update Catalog page, and search for KB3189866
3. Depending on Windows 10 version you’re using click on ‘Add’ button first x64 or the last one.
For instance, if you’re using 64-bit Windows 10, click on Add button for ‘Cumulative Update for Windows 10 version 1607 for x64-based systems (KB3189866)’, and further click on the Download button, browse and choose the download location for updates to be downloaded to your computer
4. Once downloading completes, run it, install on your computer and restart the system when the installation is over.
After the restart, visit Settings > Update & Security and check ‘Update History’ to know about the KB3189866 installation status.
UPDATE: Those who don’t want to download the update by visiting Update Catalog site in IE, can use the direct offline links mentioned below. Thanks to SS and steve.