RightEdge updated to target .NET 4.5 in build 52
. I would expect you'd get the same behavior when using the DLLs from build 52 as build 53. Build 50 and earlier targeted .NET 3.5.
Microsoft recently released Visual Studio Community 2013
, and that's what I recommend for RightEdge development. It is a free version of Visual Studio but without the limitations that the Express versions had.
I'm sorry it was hard to figure out what was wrong. In recent versions of Visual Studio, you will get a pretty good error message (in the errors list) when you try to reference a DLL targeting a later framework from a project targeting an earlier version. VS 2008 may not have handled this as well.
Where did you find the broken link about service plugin development? Here's the service plugin page
from the user guide. Here's a forum post with instructions for how to start with the source code for existing plugins that comes with RightEdge, modify it, and use it.
I've added an item to my todo list to release the indicator source code. The main reason I haven't done so yet is because the code is not very pretty- it's gone through several transformations as we changed the way the indicator interfaces worked over the years.