I have found your SimpleViewer-Pro purchase in our transaction records and have sent you a new download link (to the email address you used to register on this forum).
(If you ever need a new download link, for example if your link expires, just fill in the SimpleViewer-Pro Upgrade Request Form.)
Extract the 'simpleviewer-pro.zip' file and you'll find the 'svcore' folder in this location: simpleviewer_pro_2.3.2/web/svcore
Just upload the entire 'svcore' folder to your wp-content/plugins/wp-simpleviewer/ directory and hopefully all should be well again.
SimpleViewer Support Team