I purchased TS2 and am very disappointed because after installations, and carefully directing content into proper foldres, ST4 cannot locate pak files. I've removed the directory paths in ST4, nothing. I've added directories that it cannot find directly into st4, nothing. TStudio is authorized, nothing.
I simply created a folder "SampleTank4" and installed all my contents into that folder. You'd think it would work. Nope.
I'll make a support ticket.