Only problem with this link is that you are redirected to C|NET Download.com for the free version. Page will side scroll at first, so wait for Avast! Free to show.
Here: http://www.filehippo.com/download_avast_antivirus/ Use this link if you do not wish to jump through all the hoops to get your file. Latest version is 7.0.1426 and is a 30-day trial version with free registration. Registration will give you a license good for a year.
File size is 71.3 MB.
Word of caution: Use custom installation to avoid installing Google Chrome, untick that option to install when it appears, as when you already have Google Chrome, the new installation of Chrome will replace it.
How can I download free version of avast.