Symptoms
Is there a K2 SharePoint configuration wizard that is native to SharePoint 2013, right now it states that it is installing in SharePoint 2010 mode.
Diagnoses
SharePoint store has the most current configuration wizard.
Resolution
Go into the SharePoint store directly and get K2 for SharePoint app. Microsoft is moving everything in the direction of the SharePoint store so that is where the 2013 installation wizard resides.