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Hello Robert,
Thank you for taking time to post this issue in Microsoft Q&A forum.
Where can I download it and will it integrate seamlessly with VS2019?
You can download it from here: Windows 10 SDK or install it from Visual Studio Installer > VS 2019 > Modify > Individual Components > Windows 10 SDK (XXXX).(The latest version of Windows 10 SDK is 10.0.19041.0) To integrate seamlessly with VS2019, I suggest you install it from VS Installer.
Why wasn't a new version of the Windows App Certification kit released with VS2019 when it became available?
The Windows App Certification Kit is included in Windows SDK, it can be installed by installing Windows 10 SDK package or selecting Windows 10 SDK (XXXXX) in the optional components of the Visual Studio 2019 Installer.
For installing from Visual Studio 2019 (VS Installer), the Windows 10 SDK will not automatically be selected and updated when you update Visual Studio. So you need to select one proper version and install it manually.

Sincerely,
Tianyu
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