Github user FlorianHockmann commented on the issue:
https://github.com/apache/tinkerpop/pull/867
You're right. It shouldn't be necessary to have an internet connection when
all dependencies are already available. I thought that nuget.exe would only be
downloaded once as we have the `available file` checks, but unfortunately
nuget.exe was downloaded to a `bin` folder which gets cleaned with `mvn clean`.
So I just pushed a commit that downloads nuget.exe instead directly into the
`gremlin-dotnet` directory and now it won't be downloaded again after that.
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