In a continuing effort to provide high quality products, Autodesk has released Autodesk® AutoCAD® Civil 3D® 2015 Service Pack 1, which fixes or addresses a variety of issues discovered by Autodesk's internal testing team and by customers using the Customer Error Reporting Utility.
Please check the readme file to get installation help and to get familiar with updates. The Autodesk® AutoCAD® Civil 3D® 2015 Service Pack 1 can be installed from here.