I don't think there is another version of the software right now. I've searched the web to find it, but there is nothing available which means that version 5.0 is actually the latest one.
There is also no possible download. The page on Software Informer doesn't contain a working download link. The same applies for all the versions listed.
If you still have the software, create a backup because you might have the only version of the software that still exists.