Protobot has been open sourced and there is a new version that is being developed. Release Protobot Rebuilt 1.3.3 · BreadSoup/Protobot-Rebuilt · GitHub
It should be possible to download unity and run it through there and build a Mac version. Other options would be to use wine or another emulator like in this post For people who want to use Protobot on a machine that is not Windows….Wine!
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