The ARRL report a major new update of WSJT-X has been released. Version 2.1.0 supports the new FT4 mode in addition to the popular FT8
The ARRL says:
The WSJT Development Group has announced the “general availability” release of WSJT-X version 2.1.0. This major upgrade formally introduces FT4 as a finished protocol for HF contesting.
WSJT-X version 2.1.0 supplants any “release candidate” (beta) versions, and users should discontinue using any beta versions of the software. The latest edition of the popular digital software suite also includes improvements and bug fixes in several areas, including FT8.
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Download WSJT-X from