Yes. As it says, it just can't be uncompressed - i.e. you need to save it with either DXT1 or DXT5 compression (has no alpha / has an alpha, respectively).
That's only enabled when using the "Use TXI text for all TGA". You can either type, paste, or load the TXI text into the window. In the default state ("Use TXI file for each TGA"), it will automatically load any TXI that is named the same as its parent TGA and in the same directory. Typically you'd normally use the default mode, unless you are batch processing a bunch of textures that all use the same TXI semantics.
Funny seeing the "Hunt for Hassat Hunter" play out here... a half year later (yeah not much on Deadlystream).
On Steam the Russian is 1.5, EN is still 1.3 both seperate and the TSLRCM+M4 combo.