Unity and Astra SDK 2.1.1

Hi! I am novice and tried to use Astra SDK 2.1.1: first I wanted to build the samples provided with SDK but got the building errors. Does it reproducable? Is it possible to use latest UNity3d or only Unity 5.3.6 ? Where I can read the “Getting started” tutorial with samples? Is it exists the Slack channel of comunity of developers who uses this SDK?