I have a site license but I'm not able to find the download for the software anywhere. Any help would be greatly appreciated.
According to an education Community Manager you should have received a link when you purchased the licence.
If you didn't receive one you should contact your reseller - it depends on which region you are in as to whether logging in to the LEGO education site would enable a direct link for you.
You have to be logged in with your credentials, then click the download button.
The software for the LEGO Education version of the EV3 needs a license (either a single license or a site license). AFAIK, all EV3 Education purchases come with a Software License, which also includes instructions on where to download the software.
There is nothing preventing you from using the retail (non-Education) version of the software though, which is a free download from http://www.lego.com/en-us/mindstorms/downloads/download-software. It might prompt you to update the firmware on your EV3 to the "Home" version (currently v1.09H) but you can always switch back to the "Education" version (currently v1.09E).
Please try this link and choose the software you want http://www.lego.com/en-us/mindstorms/downloads/software/ddsoftwaredownload/
You can download the Education Edition for the LEGO Mindstorms EV3 here (footer of the page). It is available for free.
You only need a valid LEGO ID for a login. If you haven't a LEGO ID you can create one on the linked page.
If not yet had a license: Try download at this site but it will cost you RM2120 (if you're rich)...: http://lego.sasbadi.com/product-details.php?id=46&type=robotics&iframe=true&width=900&height=510
If already bought: Just follow the link at the license and enter the codes!(might need to make an account for the web)