This is the main Umbraco download, generally you won't need anything else.
Read the release blog post for 6.1.6.
Upgrading from 4.10+ and 6.0.0 beta/RC to 6.1.6
There are no config change between 6.1.4 and 6.1.6. If you're upgrading from a different version make sure to do a merge (use WinMerge for example) of all of the config files, especially the web.config.
Upgrading from older versions?
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Make sure to give the installation instructions a read.
Check the free foundation videos on how to get started building Umbraco sites. They're available from:
You'll find our über active community working hard to help each other at Our Umbraco: http://our.umbraco.org
Make sure to read the upgrade instructions before you attempt an upgrade.
We're happy to help you with any problems you encounter, so please report them in the issue tracker and use the “Affected versions” field to set it to 6.1.6. Do a search first though, if the issue already exists, give it an extra vote.
The source for this specific release is available for download from the repository (click the "ZIP" button).
PM> Install-Package UmbracoCms -Version 6.1.6