I think if you go on the BV website and download that will be the newest version available!

Second;

The difference in zipped or un-zipped is the file size!

The zipped version will be in a folder that is basically compressed
The BV contents are in effect squashed together to make the file smaller, resulting in quicker download time.
YOU WILL NEED WIN-ZIP TO UN-ZIP IT available
@ http://www.winzip.com/downse.htm

Go for the evaluation its free

The unzipped version is in a normal file which you can open straight away without any other program needed after you have downloaded it.
The file size is slightly bigger and takes a little longer to download......i would go for this option, if you are unsure !!

Last but not least !!!

The new server!!!
exactly as it says......Its a new server bluevoda have, it offers a better service and only will effect you for the better!!!

You do not need to worry about!!

Simply download the new bluevoda install and go through the normal process.......like before!