Since the release of ANSYS 15.0 in December, 2013, ANSYS, Inc. has released 4 updates. Here are details on each, so you can decide if you need to install them or not:
This update fixes a defect related to CFD models with zero thickness walls (baffles). The problem in the initial 15.0 release was that baffles do not display properly in ANSYS (Workbench) Meshing when viewing the mesh on Named Selections, and the baffles are not output correctly to CFX, Fluent, or Polyflow. This update is available for Windows 32 bit, Windows 64 bit, and Linux 64 bit.
This update fixes a problem in the initial 15.0 release in which ANSYS LS-DYNA could fail with a stack overflow problem on Windows machines. This update is available for Windows 32 bit and Windows 64 bit.
This update fixes a license problem with the initial ANSYS 15.0 TurboGrid tool, in which TurboGrid on 64 bit Windows systems could check out a license for both TurboGrid and ICEM CFD. This update is available for Windows 64 bit.
This update addresses problems in the initial ANSYS 15.0 release with ANSYS Mechanical Rigid Body Dynamics as well as any mechanical models that include joints. Data from the Mechanical Redundancy Analysis tool was not being updated after redundancy analyses were performed, so the code could not identify redundant or inconsistent constraints. This update is available for Windows 32 bit, Windows 64 bit, and Linux 64 bit.