There is no upgrade guide, just an install guide.
If you had Shadow installed on Mac, you can just delete the Shadow app.
If a Windows user is reading this, and wondering about Windows, you can use the Add/Remove Programs Control Panel to remove Shadow.
I deleted Shadow App then I installed new Edge Inspect App.
Chrome extension is updated. But I can't Run Edge Inspect on my Mac.
I have Mac Os X 10.6.8.
There's a reason to that...
You say that you can't run it.
What happens when you try to run Edge Inspect?