There have been three versions of InDesign CC 2015:
The first arrived in June 2015: 11.0 (or 2015.0) - don't have a record of the build number
The second arrived in August 2015: 11.1 (or 2015.1) - don't have a record of the build number
The third and current arrived November 30, 2015: 18.104.22.168. This is the version you can download from the Creative Cloud app.
As far as I know, you can't download earlier updates of CC 2015 than 22.214.171.124.
If for some reason you can't download from the Creative Cloud desktop app, you can download from here but read the download instructions very carefully or it will not work:
You can still download CS6, CC and CC 2014: