Moving from 1.0.0 to 2.0.0 is not a perfect process. There are a few things that break when doing so.
mpy files compatible with 1.0.0 are NOT compatible with 2.0.0 because MicroPython changed the format. A 2.0.0 bundle is available here. (Its built by changing the branch of circuitpython in the bundle repo before building it.)
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I still cannot get my Feather M0 Express to do anything on Windows 7 or 8. It works fine on my Mac. It shows up in Device Manager, but I can’t even connect to it via PuTTY. I am using the alleged latest 1.5 version of windows drivers, and Windows say they install OK. But nothing happens. The drive never shows up to load .uf2 files. It looks like everyone there only uses Macs and could not care in the least, much less test, your products under Windows.