I think I've found a bug in SpecRun installation logic. At the time I
installed SpecRun through NuGet today, I had SpecFlow 1.6.1 installed.
SpecRun however required SpecFlow 1.8.1, so SpecFlow got updated to
that version. However, it turns out the SpecFlow 1.6.1 directory
remains, with one file in it: packages\SpecFlow.1.6.1\tools
\TechTalk.SpecRun.SpecFlowPlugin.Generator.dll. For the record,
packages\SpecFlow.1.8.1\tools does *not* contain