Refresh license status first. For Google Play, confirm the purchasing Google account and allow pending-payment verification to finish. For Gumroad, confirm the purchase email and Plus key; a Demo key cannot activate Plus access.
Temporary Gumroad verification errors require internet access. Delete and re-register local Gumroad data only when you need to correct it or move to a new device. Never share a full license key in public.
Read Manage or Recover Access for the full recovery flow, then use Support if the issue remains.