After you download the sample project, please open the Nuget plugin, and upgrade all the packages to the latest version at first. Then you should want to run the project.
If you are the first time run the project, the ProductCenter will popup automatic, if you are not the first time run it, you can find the ProductCenter.exe under your project bin folder.
And then you should want login your account, and active the license or eval it. Please notice it only works for development status, if you want to deploy it to IIS please follow our guide to it.
Wish that's helpful.