Problems with the 4.8.1229 Version Avast! Home Edition

Well, it’s impossible to automatically download the virus updates, even by trying to go through the interface by clicking on the lightning, it doesn’t owrk as nothing happens.
I tried to download Avst! last version (which worked) and I wanted to uninstall my version to install the new one, but Avast! doesn’t seem to agree on being uninstalled.
Can you help me?

What operating system do you use?
Do you have a firewall?

Please, post the last 300-350 lines of avast log: C:\Program Files\Alwil Software\Avast4\DATA\log\Setup.log