I already ease up my rule for all avast application and try the manual update again to no avail. It’s still the same.

I’ll try it again after rebooting my computer once or twice, though I can’t do it now since I still have things to do. If after a few attempt it still unable to update then I’ll repair the installation (though I really hate to do this, since it will reset all the Avast setting changes I’ve made).

Really, I hope Avast adding a feature which let user to export and import Avast settings in the future Avast program update.