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Linux version when (sorry, but I bought their product 4 years ago because they said they were making one)

I don’t think they ever said they were making one.

In 2018, they explicitly said it wasn’t happening:

And even as early as 2014 they never explicitly committed to it:

They've never promised it, and said it would cost $500,000 to build it for Linux. And that was in 2014 when the codebase was much smaller.