As title says, I can't unpack any of the 3 high res texture BSAs, upon exporting the 1st texture it gives me an error (and while giving me an option to continue, it does not do so). Other BSA I tried to unpack (so far I unpacked meshes, sounds and voices) so far worked, what's up with textures?

They extract fine for me using (of all things) FOMM's BSA Browser. Maybe try a different program?