On Windows 10, 64 bit… Visual Studio 2017 Community Edition with all updates applied.
I got the Example project from GitHub:
Loaded solution into Visual Studio 2017.
Uncommented out the first example in Program.cs:
Left everything else alone in Program.cs.
When I run it the result of comparison.Compare is null causing an exception…
I tried uncommenting some of the other examples instead and they also have the same problem.
I then obtained a trial license and uncommented the lines that apply it but still getting the same problem with comparison.Compare() returning null.
It does take a second or two when I step over the Compare() function when using the stream methods, but just returns null every time.
The project from GitHub references version 19.3.1 of GroupDocs.Comparison from NuGet. I also tried downgrading to older versions of the Nuget package with the same results.