Unable to edit or open Workflows

Occasional Visitor

I am trying to see and edit workflows on our SP Online site (backend SP 2013) but all I can see is that they exist.  When I try to open them up in SharePoint Designer 2013 I get this:


I am using 64 bit SP Designer 2013.  I can't seem to install any patches because it says it effects nothing installed on my machine yet I clearly have it installed and I clearly have issues addressed in the patches.  I have already seen a post like this (and others on the web) about the patch but apparently I can't use that.  Is there another fix?  How else can I edit these workflows?