Hi Kjetil,
We've not been building Julia Studio linux distributions lately. Why? We have relatively few Linux downloads, and besides, Linux users prefer to compile for source, right? Well that has been our logic until now.
We'll start releasing Linux builds with future releases. In the mean time, Wes is working on a Julia 0.4.2 build (with Julia 0.2rc2) as I type this. Once it has been posted to the downloads site we'll let you know. I understand it will be easier to point Julia Studio to a different version of Julia once this has been accomplished.
Cheers,
Stu