They may have gone belly-up. Their website is still there, but with a 2019 copyright date. And installing either the "current" version (3.1.109.0) or the "legacy" version (1.8.44.1) brings up the internet connection error. The download link for the current version works, but the link for the legacy version does not. I had already downloaded the legacy version back in 2017 and I grabbed the current version in March of 2020. It's now August of 2021 and no new release.
Bummer because apparently even custom parts were stored in the cloud so my personal libraries are gone.