I've just purchased your above plug in however when I try

Hi, I've just purchased your above plug in however when I try to install the .zip file from the Upload feature in WP I get this message: ''The package could not be installed. No valid plugins were found''.
I've also tried to look for the plug in using the search for plugins feature but it's nowhere to be seen.

Please help, I have already paid for it.
Thanks
Beatriz