Yes but isn't that for Avast 2014?
That isn't what you have been asking for:
No because I don't know where to find the online installer for Avast 2015.
In all honesty I think you will find it hard to get the on-line installer for avast 2014 - it won't be on the avast servers as the previous links given will normally have the latest versions. If you are quick, you may find it at download.com if they haven't updated their avast version.