On Windows 10 version 1809+ you will have to install Windows Assessment and Deployment Kit + the PE module to use Aomei OneKey Recovery. These kits are no longer included in a standard Windows installation from 1809+. I had some issues installing WADK and needed to run sfc /scannow to fix some corrupt files. This was successful but I still had some fits and starts getting Aomei to create a backup, including needing to reinstall Aomei.
Based on my experience, here is my suggestion for those interested in installing and using Aomei OneKey on Windows 10 1809+:
Please note: You may wish to run sfc /scannow before you begin the steps above to identify any issues, e.g. corrupt files, especially if you install/unistall apps regularly.
1. Download Assessment and Deployment Kit (ADK) for Windows 10 1809 & Preinstallation Enivronment (PE) add-on.
You may get both downloads here: Download and install the Windows ADK
2. First install ADK and then PE add-on. If you encounter problems, run sfc /scannow.
3. Restart
4. Download and install Aomei OneKey Recovery, which you may find here: Download AOMEI OneKey Recovery Free 1.6.2
5. Restart
Now you should be able to use OneKey to create a recovery partition and backup. 
I imagine that Windows ADK and PE add-on may change with future versions of Windows 10, but who knows?
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