Symptoms
K2 For SharePoint 2013 install error
Diagnoses
You get the following error message when trying to configure a site collection.
•The selected SharePoint 2013 site collection is not supported with this version of K2.
Resolution
K2 for SharePoint configuration wizard should only be used for deployment and activation of K2 features to a SharePoint 2010 environment or site collection in SharePoint 2013 running in SharePoint 2010 Mode.
What this mean is that you do not need to activate features after the install.
If you wish to make use of pure SharePoint 2013 integration, please see the following installation/configuration guide: http://help.k2.com/helppages/K2ForSharePointGettingStarted1.0/default.htm