I’ve installed what I think is Avast Free Antivirus, though it’s showing up as Mac Security 2015. I’ve looked at the online Free Antivirus user guide, but it doesn’t match the windows I see on screen. Is there a user manual or quick start guide that covers the 2015 version or did I download and install the wrong application for Free Antivirus?
,
It’s true that there are not a lot of docs covering the Mac version, but there are fewer features to cover as well.
Here’s a link to the web help for Mac:
http://help.avast.com/en/av_mac_free/about.html
and the FAQ for the Mac version:
https://www.avast.com/en-us/faq.php?article=AVKB72#artTitle
If there are additional explanations of how to use the program that would help, please let us know and we can include more in the documentation. 
Brad