OH, my bad. It didn't say "Update" on Unity Asset Store so I assumed incorrectly that I had the latest version.
I forgot I had updated it already for a different project...
You can mark this as resolve or delete if you want.
EditorWindow_ShowModal = typeof(EditorWindow).GetMethod("ShowModal", BindingFlags.Instance | BindingFlags.NonPublic);
2019.4+? (TODO: Determine which version of Unity changed this)
EditorWindow_ShowModal = typeof(EditorWindow).GetMethod("ShowModal", BindingFlags.Instance | BindingFlags.Public);
shift + C didn't seem to work but shift + alt seems fine
I'll try changing the code later today.
Maybe it could be shift + C?
This Unity Project was started in 2018.3
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