The duplicacy UI wont even start anymore…
You can remove the existing (expired) license on macOS by running this command:
defaults delete com.acrosync.mac.duplicacy License
For Windows, delete the registry value HKCU\Software\Duplicacy\License (HKLM\Software\Duplicacy\License if you installed Duplicacy for all users).
I’ve refunded your new license purchase.
thanks you. all solved then 
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