IMPORTANT FOR THOSE WHO DO NOT UPDATE AVAST.
If you get the error that says "File signature is not valid. Installation will end" As much as giving the button update 3 or 4 times usually catch a server that works.
I am like I am updating the avast when it does not update, at worst it says 2 or 3 times that of the signature but to the 4º update.
The servers (only some) are bad and when they download a file called uat.vpx gives the error, but as I say ONLY IN SOME SERVERS, if they insist 2 or 3 or 4 times should update without problems.
They will tell me if it works (well to me if it works)
Greetings to all.
PS: and forgive the spelling because using google translator I do not know if this will be very well translated.