Just a quick heads up that there’s an issue that has been discovered with previews 1 and 2 of the Windows App SDK, as documented here. There is an upcoming preview 3 which will address this issue.
At the time of writing, the latest stable release is v0.8.5. There is also a v1.0.0-experimental1 build that can also be used.
Alternatively, if you’re happy to take on the risk, you can simply continue using preview1 or 2 – just be warned!