Prepackaged releases which install automatically and allow you to build your own operating systems with Cosmos and Visual Studio. For the Userkit you’ll need these:

Devkit (Developer Kit)

The Devkit has the following requirements:

Besides, always including the newest bug fixes and features, the Devkit additionally allows you to directly work with COSMOS source code as well. Installation simply requires running a .bat file after each source sync.

See for more information on how to install both the userkit or the devkit.