Compile Error 'RuntimeInformation' does not exist in the current context

When I was trying to compile this project at first time with Visual Studio 2015, I ran into these errors.

Error	CS0103	The name 'RuntimeInformation' does not exist in the current context
Error	CS0103	The name 'OSPlatform' does not exist in the current context

And before those errors vs 2015 was asking me for .NET Framework 4.8.

First I was trying to install .NET Framework 4.8, but didn’t solve the errors. https://dotnet.microsoft.com/download/dotnet-framework/net48

Then after few googling, I found this site was helping. https://www.nuget.org/packages/System.Runtime.InteropServices.RuntimeInformation/

So I go to Solution Explorer find this project, right-click, Manage Nuget Package… In the Browse tab, Search “RuntimeInformation” then find the “System.Runtime.InteropServices.RuntimeInformation” Package name, 4.3.0 is the newest for now, and click Install.

Then rebuild, all errors are gone.

[myfingerhurt]

Another problem, STUN from Google not always works very well. Your external IP can't be obtained. You are blocked :-( .\p2p-main\p2pconn\Form1.cs

Need to be able to change the STUN server address, so better to expose STUN server address into the GUI.

[miroslavpejic85]

Good…, No need for port forwarding, being P2P.