For the latest system requirements, visit http://www.adobe.com/go/indesign_systemreqs.
For a list of the latest system requirements for other Creative Cloud products, see http://www.adobe.com/products/creativecloud/tech-specs.html#requirements.
Creative Cloud trials are "try and buy", allowing you to evaluate individual products or editions and then convert the installed trial to a full version. You can convert from a trial to a full version at any time by signing up for a subscription. If you purchase a subscription, make sure that you are online and have logged in with an Adobe ID to start using your full version.
For a list of the new features delivered InDesign 2015.2, see Adobe InDesign CC 2015.2 Release | November 2015.
Sync Settings has been removed in InDesign CC 2015.2. The existing service in InDesign CC and CC 2014 will become unavailable in the near future. For an introduction to preset migration, see the following video.
For general Adobe community, visit https://community.adobe.com.
To find help on topics related to downloading, installing, and getting started with your software, visit http://community.adobe.com/t5/get-started/bd-p/get-started?page=1&sort=latest_replies&filter=all.
For product Help plus community-based instruction, inspiration, and support, visit http://www.adobe.com/go/learn_InDesign_support_en.