This should be the last release of the 0.9 series as we are moving to getting Halcyon fully Linux compatible and going to the 1.0 series.
This is also the first release with precompiled binaries. Please understand that these binaries are being provided AS IS. They are built on 3rd party servers that we have no control over, using libraries pulled from sources that we have no control over. All that means is that if your systems are mission-critical to your business you should compile everything yourself.
If you choose to use the binary release in spite of the dire warning above, Most people should use the dotnet release. This will run on most Windows installations, .NET 4.5 or newer required. Those intrepid few who want to try running experimentally on Linux can try the mono release. Please note that running on comes with a mile-long list of caveats at the moment; the various grid servers run fine, it's the region server that's got the core issues. Getting the region server fully Linux compatible is the goal of milestone 1.
The main fix in this version is #456 is now resolved, meaning that importing the OAR 0.2 files produced by Halcyon will now properly permanently record the region settings. This should help with any rebirth of the InWorldz grid, or anyone wanting to load their OAR files from InWorldz into another Halcyon grid.