Hi,
If you need Windows 10 1909 feature update, we need to download package KB4517245. However the package is not available to download from Windows Catalog Update. Microsoft have deleted it from Windows Update Catalog since is was replaced by the latest version Windows 10 2004.
I would not recommend to download from third party website even though they have saved KB4517245, but we can't sure if it will bring any security risk or insert any virus software into this package.
I noticed you want to update multiple computers to Windows 10 1909. I would recommend to use Windows 10 1909 ISO image to upgrade system. If you have subscription for Volume Licensing Service Center, we could download Windows 10 1909 ISO from there.
After that, we could perform in-place upgrade on multiple devices with MDT. In-place upgrade will not affect system configuration and personal data.
Perform an in-place upgrade to Windows 10 with MDT
If you need any assistance, please reply to us directly.
Bests,
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.