Thanks, I followed the steps below and was able to not only restore my Poweramp purchase, but also received the latest updates. I purchased the app 9 1/2 years ago and can once again enjoy listening to music.
Hopefully, this will also help someone else.
Restore Poweramp Purchase
Please use Settings / Already Purchased? Google Play:
You can reinstall Poweramp Full Version Unlocker any time for free as long as you use the Google account you bought it with. Note that for Google Play Store purchases, if you have