The changes between versions are listed in the Revision History forum a little further down this list. One of the main items in the change in the branding and new system for upgrades, i.e. free updates (no time limit) within a major version, i.e. version 6 series. Please refer to the NC Software policies page regarding our upgrade policies for the latest information. To receive free updates, you will need to be in the 6.x line of software for APDL.