Hi @radjr,
OJS 2.4.9 has not been released (and our plans for it aren’t concrete yet). For the latest OJS 2.4.8 release, you can follow the directions here to get ReCAPTCHAv2 working: reCAPTHA v2 for OJS 2.4.8
Regards,
Alec Smecher
Public Knowledge Project Team