Oh, the base instruments are in a pack called "sounds". If you use "IMP sounds" you should be able to load them in-let me know if that doesn't work!
it doesn't, i'm trying the "welcome file" and it says "Error importing file sounds => Error: invalid number format: 0,5"
Oh wow, that's strange! I haven't seen anything quite like that. Do you mind sharing what OS you're using it on?