WSJT-X 2.5provides features and capabilities new since version 2.3, including the Q65 mode and improved rig control. New features are described in the WSJT-X User Guide here and in the Release Notes. If you will use the new Q65 mode, please read the Quick-Start Guide to Q65.
On Windows platforms, WSJT-X 2.5 also includes MAP65 3.0.0, a wideband polarization-matching tool intended for EME. If you will use MAP65, be sure to read the Quick-Start Guide to WSJT-X 2.5.0 and MAP65 3.0.
Upgrading from a previous version will be straightforward. There is no need to uninstall or move any files. If you want to make sure to have the latest list of default working frequencies, go to File | Settings | Frequencies, right-click in the Working Frequencies list, and select Reset.
Read more at: https://physics.princeton.edu//pulsar/k1jt/wsjtx.html