Oh man I am so late here...
Sorry I didnt answer, never actually used the notification system.
Well, I send you the pack again to your email adress. Maybe you use linux or mac and that causes your issue... I use a regular windows 10 to pc with a newest version of photoshop, if that helps you in any way.
You are actually to be honest the only one that wrote me about that problem. All other customers just baught it and that was it.
There is only one .psd there and its called PowerUps.psd. If you need it somehow converted (of which I have no idea right now), send me and email and I try my best.
If not, I hope you enjoy your pack and do some great games with it.
Have a good one,
1up Indy