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I downloaded manually, as suggested. The manual install took a while too but went well. It did not help with the other ongoing install. Even after a reboot. I searched a bit and found suggestion deleting some ~/Library/Caches files may help. I deleted files in relation to store (app store). Rebooted. Launch Pad was showing an empty progress bar for a short while and then disappear. Now XCode shows as "GET" on the app store. But now, at least, installd is not eating up 120% CPU... thanks.

Proposed solution I managed to get around the issue by using Element.scale(by:) in the extension's definition of Array.scale(by:) and not using the * operator. Using * operator required Element and Double to conform to _VectorMath (which is what we wanted to avoid). Follow-up on questions and remarks Just my curiosity, how are you trying to make Array conform to VectorArithmetic? I see them as coefficients of polynomials (as in the algebraic definition). If I am not mistaken, it can be a vector space. For example, what is your definition of +? Two Arrays may have different sizes. Add coefficients pairwise; and if one array is shorter than the other one, use AdditiveArithmetic.zero for the "missing" element. > What is _VectorMath protocol? Not documented publicly. I did not see this sooner, but if I option-click on the _VectorMath, there's the quick help: SummaryAdds the “vector space” numeric operations for any type that conforms to Animatable. #### Declaration protocol _VectorMath : Animatable I am not sure what to make of this. But as you suggested I'd try not to use this "private" (?) API.

There is a related question https://developer.apple.com/forums/thread/653471 "Add UIKit view into iOS 14 Widget" The reply: "UIKit views wrapped in UIViewRepresentable will not work in WidgetKit. When the views are encoded from your extension to be displayed they will appear blank. "