You should have saved the email attachment (license.avastlic) to your hard disk and then double click the saved license.avastlic file, this should insert it automatically.
If that is what you tried then I would suggest that you do a clean install of the version you purchased rather than try to insert the license into the trial version.
- Download the latest version of avast, 7.0.1456, see links below 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 5.x, 6.0.x and 7.0.x).
- 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, first for 6.x if previously installed and then for 7.0, once complete reboot into normal mode.
- 3. install the latest version, reboot.
You don't say which version you purchased, but here are the download links for both:
Pro AV: -
http://files.avast.com/iavs5x/avast_pro_antivirus_setup.exeAIS: -
http://files.avast.com/iavs5x/avast_internet_security_setup.exe