Termination Shock

• Fixed a serious bug resulting in file corruption of mods installed via the CKAN (#205). Thanks to @godarklight for finding this.

All users of v0.15.1, and v0.16 are encouraged to upgrade, and re-install all mods installed using those versions of the CKAN.

Hydrogen Line

• Fixed bug where users with too few or many detected KSP installs couldn't run ckan.exe. Use ckan ksp help for options on manipulating your installs (#188).
• netkan.exe added to releases, this is primarily of use to mod authors and packagers.
• netkan.exe no longer requires a KSP install to operate (#190).
• netkan.exe now understands extended $kref syntax (eg: #/ckan/kerbalstuff/269).

Hydrazine Princess

• Fixed a bug where nobody could download (#185)!
• sha1 sums in the CKAN registry are working again.
• Installing, uninstalling, and upgrade operations are now transactional. If something goes wrong, your GameData directory and CKAN registry are restored to their former state. Yes, this is awesome.
• ckan list shows which modules are providing virtual packages.
• ckan install better understands virtual packages, and gives suggested choices.

Spin-stabilised

• Bails out if a mod has meta-data that would result in no files being installed.
• No longer detects DLLs as mods if they're already part of an installed mod (existing users: ckan scan to refresh).
• Display what virtual mods are provided and by whom in ckan list
• Fewer file locking issues under Windows

Carbonaceous

• The GUI no longer wishes to upgrade all the mods, all the time.
• Better support for multiple instances using the GUI.
• ckan install -c YourMod.ckan will install a mod from a local CKAN file.
• Better error messages in the GUI
• Improved internal architecture and structure

Hydroloxier

• Same as v0.12 (Hydrolox) but fixed a bug where the GUI would crash if multiple KSP instances were defined, but none were set to default.

Hydrolox

• Support for multiple KSP installs.
• Download size of remote files reported where known.
• Dependency browser panel in GUI
• Mod contents preview for downloaded files
• Stronger checking of CKAN metadata
• Expanded mod info panel in GUI
• Launch KSP button in GUI
• Skipped a bunch of version numbers, just like KSP!

Course Correction

• Fixed a bug where mods would not installed if they contained a folder called Gamedata instead of GameData.

Moar polish, moar mods

• More GUI improvements
• Linux compatibility fixes
• Allow installs to Tutorials and GameRoot
• ckan upgrade implemented
• Extra support for mods hosted on KerbalStuff

GUI ready for lift-off!

• We have a GUI! ckan gui or just ckan will start it
  (thanks to @AlexanderDzhoganov)
• This breaks existing CKAN registries. You'll have to wipe your
  existing CKAN dir if using CKAN 0.04 or earlier.
• Users are only given KSP mods which work with their version of KSP.
• Relationships (suggests, depends, recommends, conflicts) implemented.
• (Internal/Meta) Debian licenses spec adopted.
• Many, many minor bugfixes and improvements.