Steps for Mac Installation

[bosny]

Here are the full steps I took for this to work on Mac (I am a noob, had a friend help me through this)
first I had to install brew: https://brew.sh/
then, I opened Terminal and input: /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
then (and subsequently) in Terminal: brew install python
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python3 -m pip install --upgrade pip
python3 -m pip install --upgrade Pillow
then I drag the autoscape app icon from the extensions folder into terminal for the full file paths, mine looked like this: /Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions/
then I typed: cd /Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions/
curl https://raw.githubusercontent.com/fablabnbg/inkscape-centerline-trace/master/centerline-trace.py -o centerline-trace.py
curl https://raw.githubusercontent.com/fablabnbg/inkscape-centerline-trace/master/centerline-trace.inx -o centerline-trace.inx

I hope this helps others! I am still struggling with getting it to work inside Inkscape, but that is a different thing.