After nearly a month of trying to download 15 GB of updates after upgrading to Logos 6, I broke down and bought an ethernet cable. Downloaded updates in no time. I am using a Mac Airbook and never had wifi download issues. In fact, after upgrading to Yosemite OS I still had no problems with wifi downloads outside of Logos 6. None of the suggested fixes offered by Logos worked. Don't know why but Logos 6 is the only program on my computer that had wifi issues.
My point? If you are having same issues just ethernet your computer to get updates.