It seems to be OK now. Admittedly I changed the version number, tried Release build, and upgraded to latest Big Sur. But after all those changes the Help Book now matches all the changes I made.

This was my fault! I had added the CSS file and the Build Action was set to Embedded Resource instead of Bundled Resource. Now it is fine. 😊

Turns out that there was a problem with my code that installed the default data. Oops.

Here is the really odd thing ... If I set the focus to the WebView and use Print from the File menu, it is fine! But if I use: var appleViewToPrint = Platform.CreateRenderer(viewToPrint).NativeView; var printOp = NSPrintOperation.FromView(appleViewToPrint, NSPrintInfo.SharedPrintInfo); printOp.JobTitle = "Elderly and Infirm Rota"; printOp.ShowsPrintPanel = true; printOp.RunOperation(); It is blank. Related discussion here. - https://stackoverflow.com/q/66398848/2287576

I now see two related questions - 8 month and 5 months. No response from Apple. ??

I would like to know too, for iOS and macOS. How we can do xslt transformations. Doesn't the support staff read these questions?

My colleague uninstalled the application and tried using the PKG file a second time and it did install to the Applications folder. I am not sure why it failed the first time.

I expanded the PKG into a temp folder and I saw: install-location="/Applications" auth="root" So it seems it should have installed to that folder and not the folder where the PKG was.

I think I have it working. There were a lot of unknown steps. I stumbled on a useful page: https://developer.apple.com/documentation/xcode/notarizing_macos_software_before_distribution/customizing_the_notarization_workflow?preferredLanguage=occ#3087734

I see something about it but need instructions for VS for Mac.

What do you mean "notarized"?

Thanks. I managed to add the required resources with this UTType value. Sorted. 😀

Worked it out. Constraints.