Whaaaaaat? Apparently a bunch of Unity LTS versions are now locked to the Industry/Enterprise versions: https://unity.com/releases/editor/archive
The Industry license Unity forced us onto last year (a different story) finally expired, but apparently we were building our game against a LTS version that was only available to us via that license.
Now we either have to figure out how to downgrade (not officially supported), or upgrade to a *way* newer version and fix all the resulting bugs. -_-
