Windows 10 App Essentials 21.04 is now available.
In addition to source code refinements, this update is dedicated to Calculator app. Specifically:
IMPORTANT NOTICE on Windows 10 feature update compatibility: the next version of Windows 10 App Essentials add-on will be the last version to support Windows 10 Version 2004 (May 2020 Update/build 19041). Also, although not set in stone yet, the next version may also require NVDA 2020.4 or later.