May i know what error you are getting?
Did you changed google keys for v3?
Can you share your form page url?
(This plugin does not even offer any additional feature in PRO version, this money is for the time i spend behind this plugin. why you even purchase this?)
(I already informed my billing department to refund you. You will get your refund in couple of days. As this is an emergency situation here, refund may delay couple of days, but you will get it, don’t worry)
To allow for better troubleshooting in the future, I am using wordpress with boldgrid as the controller, I did try a v3 key and put it all in place, reset cache on both cloudflare and the local system and anytime I attempted to login to my admin panel it instantly denied it even though if I do it without it it works, If I use it with just v2 it’s fine and works like it is supposed to. So I have no idea why it would work with v2 but not v3.