What is the difference between Enterprise and Standard versions of the module?

Standard license of Ultimate DNN banner allows you installing the module only on one web domain. Enterprise license of the module allows you multiple installations on multiple domains, websites or portals.

How to add a windows popup event (on click) for one of the banner image?

This is an example of the code that you need to set in the module Settings -> Advanced Settings -> Footer:

<script type=text/javascript>
var link1 = jQueryCS(".cs-slideshowDiv > a").get(1);
jQueryCS(link1).click(function(){
window.open('http://www.elocallink.tv/vp6/spon-fcsa_a.php?sponid=UmZVZlI3Uj9TYw==&fvm=1','elocallinktv','scrollbars=yes,resizable=yes,width=716,height=540,left=0,top=0,ScreenX=0,ScreenY=0');});
</script>

get(1) or simply 1 means that this popup is set for the second item (items are in the "Manage Items" section)