The links lead to different places. I believe I only need the Fixed Assets Depreciation Network Server 2015. When you click the link for 2015 Fixed Assets the instructions are:
""Please make sure that you are on the following version of Sage Fixed Assets before upgrading: 2014.1"". I need to install it for use on version 2015 (5.2). Since there are no other options I will proceed and hope nothing breaks.