My guess is that it has something to do with a recent Eclipse upgrade. Photon is Eclipse version 4.8, which is the last officially supported version for use with Atelier.
If your code base is especially large, you might want to consider creating projects like
Keep in mind that Atelier projects don't play nicely with XML files that aren't supported by the UDL transformation engine. The community should be able to steer you in the right direction if that becomes a blocker for you.
try copying the 1.3 stable update site (jfrog.io) into your browser - if you can't access it, then verify your connection settings
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