Yeah, I spoke to the developer of ImageAlpha. He considers the project "dead" as it was written in Python 2. He is leaving it up there for now and as long as the OS supports it your computer should be able to run it. Furthermore, he suggests using Squoosh going forward. I like the two main contributor surma and jakearchibald of Squoosh (and their YouTube show will be dearly missed), I don't like that it isn't native.
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