Version of Advanced Rocketry

1.12.2-2.0.0-7

Have you verified this is an issue in the latest unstable build

Yes

Version of LibVulpes

1.12.2-0.4.2-22

Version of Minecraft

1.12.2

Does this occur without other mods installed

Yes

If Y, what is the MINIMUM set of mods required.
Only advanced rocketry and libvulpes.

Crash report or log or visualVM (if applicable)

https://pastebin.com/ZJFQcJYd

Description of the problem

"Latest version" of advanced rocketry and libvulpes crash together when downloading on launcher with no other mods. Can replicate by creating a new profile/pack and just downloading advanced rocketry then updating to the latest beta on the versions tab then it'll prompt you to update again giving you the AR 2.0.0-7 version. version 2.0.0-12 works. The problem is it prompting people to use the broken version. Hope this helps, thanks!

Maybe curse is taking a bit to update as I archived that version when I found it was bad while working on getting it working properly. Not sure what happened. If it continues I'll reach out to curseforge support.

I tested today looks like it has resolved itself so far in my launcher.