Ctf file not valid

Hello Francisco,
We are sorry to hear about that. Are you receiving this error message when you try to install the latest version of AVG? Please share a screenshot ( http://avgclick.me/getscreenshot ) of the error message you are receiving to assist you further. Thank you.

Francisco, Also for your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. 
AVG Guru

when i try to upgrade avg free, is coming one message "ctf upgrade file is not valid", how can i fix this problem?

Hello Francisco,
We are sorry to hear about that. Are you receiving this error message when you try to install the latest version of AVG? Please share a screenshot ( http://avgclick.me/getscreenshot ) of the error message you are receiving to assist you further. Thank you.

down right.....