It turned out that the hardest part of installing Visual Studio 2019 was freeing up the 18 GB or so of space that was required. If you are installing it for use with Snaps from my wonderful Begin To Code with C# book you can do a very ordinary installation, but you do need to select to two options that I’ve marked in red above.
If you do this you should find that the Snaps you can download from GitHub here should just work.
If it doesn’t work please let me know. It might work just for me because I have some libraries already on my machine. I’m going to try with an “empty” machine, but I need to set it up.
Update: If you are finding the image hard to read, make sure that you select Universal Windows Platform Development and Windows 10 SDK 10.0.18632