How can I get the version of SharePoint that is installed on my server?
open SharePoint Management shell and type command
(Get-SPFarm).Products
you will get the GUIDs. Find your GUID from below list. That will be your installed SharePoint version
GUID Product
35466B1A-B17B-4DFB-A703-F74E2A1F5F5E Project Server 2013
BC7BAF08-4D97-462C-8411-341052402E71 Project Server 2013 Preview
C5D855EE-F32B-4A1C-97A8-F0A28CE02F9C SharePoint Server 2013
CBF97833-C73A-4BAF-9ED3-D47B3CFF51BE SharePoint Server 2013 Preview
B7D84C2B-0754-49E4-B7BE-7EE321DCE0A9 SharePoint Server 2013 Enterprise
298A586A-E3C1-42F0-AFE0-4BCFDC2E7CD0 SharePoint Server 2013 Enterprise Preview
D6B57A0D-AE69-4A3E-B031-1F993EE52EDC Microsoft Office Web Apps Server 2013
9FF54EBC-8C12-47D7-854F-3865D4BE8118 SharePoint Foundation 2013