Randy Thompson, K5ZD, writes on the YCCC reflector:
There is a big event happening in ham radio today. The new release of WSJT-X is out and it will require a major migration for FT8 users. The new WSJT-X support for FT8 is incompatible with the old one. I don’t think we have seen this kind of dramatic change in a mode before. I installed the new version and got on 30 meters. Lots of signals, but not many decoding. But, this is day 1. I am sure people will upgrade quickly.https://physics.princeton.edu/pulsar/k1jt/wsjtx.html
The current General Availability (GA) release is WSJT-X 2.0.0The FT8 and MSK144 protocols have been enhanced in a way that is not backward compatible with older program versions.
The new protocols become the world-wide standards starting on December 10, 2018, and all users should upgrade to WSJT-X 2.0 by January 1, 2019. After that date, only the new FT8 and MSK144 should be used on the air.
Release Notes for Version 2.0.0:
Upgrading from a previous WSJT-X version will be seamless. There is no need to uninstall a previous version or move any files.