Microsoft Office Questions? Ask a IT Expert for Support ASAP
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Updates are rolled out in waves there's a few reasons why it might not show up. You can still manually update if you want to though. By choosing "Update Now" at: https://www.microsoft.com/en-us/software-download/windows10 Your PC will download the an installer that allows you to manually perform the upgrade to the latest feature build at any time.
The website only offers the latest version of Windows.
If you want to see the Windows Update History and it's information, open this link: https://support.microsoft.com/en-ph/help/4529964/windows-10-update-history
If you want, I found a full version of Windows 10 - 1909 installer.
For 64bit: https://www.itechtics.com/?dl_id=75
For 32bit: https://www.itechtics.com/?dl_id=76