Button "Auto update" doesn't work

I have selected Auto update option in Settings > Updates > Program update. But It doesn’t work. Can you fix this bug please? Thanks. It looks like this problem is since version 5.

What do you mean “it does not work”?
Please, upload (attach) the avast log:
C:\ProgramData\AVAST Software\Avast\log\Setup.log
or C:\Program Files\Alwil Software\Avast5\Setup\setup.log

If the file is too big for the forum, post the last 400-500 lines of it.