carlcc,
Yes, download the pro v.5 version to your computer from
www.avast.com;I suggest clean install, but there should be okay just with upgrade (not sure because I use clean install).
If you chose to do clean install, do not forget to create system restore first. Uninstall avast 4.8 from control panel, or use avast uninstall utility (more safe), get it here:
http://www.avast.com/uninstall-utilityAfter uninstall - reboot your system. Then install avast v.5.
To get your subscription active again. Take a look to avast GUI >> Maintenence >> Subscription - there would be an option to use our avast 4.8 valid key. Click it! Then it should take you to:
http://www.avast.com/resend-license.phpPlease fill the form with your valid data. Then avast will send a file (.license) to your mailbox. Use it to activating avast 5 pro
Good luck.