You're welcome.
Well on 4.8 there is no update from the GUI effectively as if you check for update you will see it is up to date.
A clean install is best I would say:
- Download the latest version of avast, 6.0.1289
http://files.avast.com/iavs5x/setup_av_pro.exe and save it to your HDD, somewhere you can find it again (if you didn't save your last download). Use that when you reinstall.
- Download the avast! Uninstall Utility, aswClear.exe
find it here and save it to your HDD (it has uninstall tools for both 4.8 and other avast versions).
- 1. Now uninstall avast! (using add remove programs, if you can't do that start from the next step), reboot.
- 2. run the avast! Uninstall Utility from safe mode, for 4.8, once complete reboot into normal mode.
- 3. install the latest version, reboot.
####
- avast! 5/6 Pro license convert from 4.8 Pro license. Try
http://www.avast.com/resend-license.php now, fill in the form giving your email and 4.8 Pro License key and they will send the new license file to you (presumably it will check you have a legit 4.8 Pro license first). Whilst this mentions avast5 the license file format is also valid in avast6.