XLS Padlock Menu in Excel Missing

Installation issue:
XLS Padlock Manager indicates everything is installed correctly and registered.

Developer Tab is present is Excel Menu.

XLS Padlock menu is not available. I have contacted support, but I’m getting any responses. How do I run the application?

First, please check whether C:\Program Files (x86)\XLS Padlock 2019\XLSPadlockAddin.dll exists.
Then, click Add in the COM Add-ins dialog box, and choose the DLL in the Select File dialog box.