The Tiled code has changed a lot over the years. You might be reading a tutorial for an older or newer version.
The latest version is actually pre-release 3.6.0-beta0001
Try installing that one and see how you go. You might need to click the "pre-release" checkbox in Visual Studio.
I'm trying to get into the habit of writing up tutorials on all this stuff but it does take quite a bit of time to do each one and I can only really do 1 or 2 per week. I'll be putting them on the new website.