As listed here it states the package is unlisted.
I think an unrelated issue is causing the connection to fail (half the time; some packages successfully upgrade during the Upgrade/Hotfix); however, once I finish the automated installer I cannot use the NuGet package browser because the package is unlisted.
Will this be updated to one of the other many RxJS NuGet packages so I don't have to drop down to command-line/manual install for getting these dependencies?
Edit: Relevant GitHub issue
I've written a small blog post some time ago about updating .NET version for Kentico projects and also updating to newer versions of Rx packages. Please read it here.
I would recommend contacting the owner of the project. This is not a Kentico project so we cannot give you any answers.
Please, sign in to be able to submit a new answer.