Just to confirm I am seeing the same symptoms. After struggling for some time to configure remote astrometry.net solving I googled the error message text and found this thread. I am running KStars on Windows 10 with my remote indi server being a Raspberry Pi 4 using the astroberry 2.0.0 distribution.
With KStars 3.3.8 I get the error on connecting to the remote INDI server that the astrometry.net binaraies cannot be found.
I downloaded the latest nightly to test (build 220) but this crashes as soon as I start EKOS, or sometimes when I first click on the align tool tab.
I also tried build 218 and see the same crash.

Now reverted to KStars 3.3.6 and it appears to connect OK now, but the solver always fails. I tried to turn on debug via the INDI control panel, but it immediately turns itself off again. Not sure where to go from here.

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