The v1.54 release adds the latest decoder from the WSPR-X application to the KiwiSDR WSPR extension.
To try it select "new" from the menu labeled "decoder" on the WSPR extension control panel. Make this selection before starting the decoding process, which is usually by clicking one of the band buttons.
The previous "old" decoder still exists and is selected by default. The new decoder is a work-in-progress and may have a few quirks. You will find it is much faster than the older one. It also supports type 2 and 3 WSPR messages which allows compound callsigns (prefix and/or suffix) and 6 character grid square locators.
As always, your feedback is appreciated.