The procedure to UNinstalled Paymee is just like most Windows programs.
To UNinstall Paymee:
1) Close all Excel sessions.
2) Open the Windows Settings and search on Uninstall then Select Apps & Features from the left menu choices.
...if not listed (some Windows versions) use the top right to search for "UNinstall"
3) Select Paymee V4 from the list and click Uninstall