The best way to get the latest changes for your Visual Studio 2015 solution in TFS.

1. In the "Team Explorer" tab, click on the Home icon which looks like a little house.
2. Then click on: "Source Control Explorer"
3. In the "Source Control Explorer" pane that appears, browse the "Folders" section at the left to find your source location.
4. Right-click on it and pick: "Get Latest Version"

Do NOT simply right-click on your solution in the Solution Explorer and pick "Get Latest Version (Recursive)" as this will not pull down new supporting files such as new NuGet dependencies outside of your solution. Duh!