Hi,
I came across this plug-in when searching for a Captcha-free anti-spam solution for some of the websites I manage. Since this looked quite promising I installed the latest version (v1.0.8), but noticed Contact Form 7 was not sending any messages.
Webserver error log is showing:
Backend log: Prevented attempt to send form. Message: Antispam Token not found in request body. Request body: {"_wpcf7":"5","_wpcf7_version":"5.5.3","_wpcf7_locale":"nl_NL","_wpcf7_unit_tag":"wpcf7-f5-p13-o1","_wpcf7_container_post":"13","_wpcf7_posted_data_hash":"","your-name":"XXX","your-email":"[email protected]","your-subject":"Testbericht","your-message":"Does it work?"}\n, referer: https://www.example.com/

I installed some eaerlier versions and got v1.0.4 and 1.0.5 working. I couldn’t establish if they were actually blocking spam, but I did notice tokens were generated and stored in the database.

Next steps:
Installed v1.0.6 but that couldn’t be activated and generated a fatal PHP error.
Version 1.0.7 and 1.0.8 installed properly and able to activate, but with both versions I am unable to send messages through CF7. There are no tokens generated in the database.

Can you check what is going on and fix this?