If you have a PC running Win 8, sadly I have, you already have what is probably the worst OS to come along since ME.
The pro pack is MS's lame attempt to try and convince the public that they haven't bombed again. I wouldn't give them a dime for any upgrade to 8 unless it reverted it to something like XP or 7 and completely removed all traces of 8.
Even more sadly getting rid of 8 and installing a functional OS seems to be impossible. I tried replacing the hard drive and loading Win 7 Ul but the BIOS & hardware won't accept 7.