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CanaryチャネルのEdge入れてる？

https://docs.microsoft.com/en-us/microsoft-edge/webview2/gettingstarted/winforms
＞Ensure you installed the following list of pre-requisites before proceeding:
＞Microsoft Edge (Chromium) Canary channel installed on Windows 10, Windows 8.1, or Windows 7.
＞Visual Studio 2017 or later.