If you want to try V2.0 with Windows 8, others have reported that you need to disable any popup blockers in your browser in order to do the install.
I have found v1.7.2 much more reliable for various reasons so I'd stick to it if you can resolve the issue you have with it (Kaspersky or whatever).
What is the error. Is it already downloaded ebooks you can't read; if so unlikely to be a firewall issue.
Sometimes ADE gets is registration confused and half-remembers it.
Try ctrl-shift-D to ADE to remove the old registration, then restart ADE and register again with your Adobe ID.