A few months ago we put the source code for the Orion SDK on GitHub under the Apache 2.0 license, including the SWQL Studio and SwisSnapin (PowerShell) tools and the samples and documentation. Today I am taking the "Beta" label off of the tools built from that source, so this now the 2.0 release of the Orion SDK. You can download the installer from Release v2.0.50 · solarwinds/OrionSDK · GitHub.
The installer no longer includes the documentation. That is now hosted on the GitHub wiki: Home · solarwinds/OrionSDK Wiki · GitHub. This way we can update at will in response to new issues or new questions and you can always have the latest docs without waiting for us to test and release a new numbered version of the SDK.
As always, you can ask your Orion SDK questions in this forum. If you see a bug in the SDK tools, feel free to open an issue on the GitHub project: Issues · solarwinds/OrionSDK · GitHub.