If you register with the same email, you will only get your license good until the original date I believe. However if you register with a new email, the system should see you as a new user and give you a full year.

It’s not a major deal since the new release of 6.0. Actually what I would do is if your current version of 5.1 is due to expire very shortly, I’d use it until the expiry date. Then I’d do an uninstall/clean install since the files are copied in a different location on your machine, and register at that time under the same email address. When this thread first started, we had no idea v.6.0 was being released this soon.

Here is the new Avast uninstaller for ALL versions (including 4.0 - 6.0): http://files.avast.com/files/eng/aswclear6.exe

Here is the download file for 6.0.1000 Free: http://files.avast.com/files/avast6final/setup_av_free.exe

Let me know if you have any questions. Thank you.