Existing customers that used jv16 PowerTools for many years got used with the old licensing model, based on a license key file.
For this reason, we created this page explaining the old vs the new licensing models, why we changed when jv16 PowerTools 2017 was released and what can you expect in terms of licensing for the next versions: https://www.macecraft.com/subscription-licensing-model/
Last but not least, we hope to obtain new feedback from you in case you feel that you own a license but cannot activate.
Please do not post private license details on the forum as a part of a public reply. Contact us by opening a support ticket instead: https://macecraft.zendesk.com/hc/en-us/requests/new