Make sure the hires pack is not there. Rename the hires file (can't think of the name offhand, edit: hirestex.res, just rename it so the program can't find it when it launches)
Up a 190. Look at the seat back.
Install the hires pack.
Up the same model 190. Look at the seat back.
The small print should be way clearer on the hires pack.
Wiley.