For completeness here's a ZIP file with all three SFZ files, one for each of the harpsichord stops: 1, 2, Lute.
For those that have missed it, you should download the Kontakt version of the Blanchet harpsichord from:
http://sonimusicae.free.fr/blanchet1-en.html
Extract it somewhere. Download the above ZIP file with the three SFZ files and copy them to the location where you put the harpsichord samples. The three SFZ files should be in the folder that contains the NKM and NKI files (it's also the folder that contains three sub-folders, each having the actual WAV samples).
Download the free Sforzando player from:
https://www.plogue.com/downloads.html#sforzando
Open Sforzando, click where it says "INSTRUMENT: empty" and choose import and then browse to the location above and select one of the SFZ files.