I paid for jav-it and notice that downloading from FANZA is the feature of Patreon version. I am going to subscribe on Patreon and join FANZA monthly subscription in order to download videos using the Patreon version. As far as I know, I may need VPN to visit FANZA, is the Patreon version still work for overseas IP? And how can I contact the Developer for more details about the Patreon version?

Hi there. Just as a heads up, while the Patreon version does support dmm.co.jp, it does not (yet) have subscription support. Subscription support only works for R18 at the moment. However the Patreon version still allows you to place-shift the paid titles you have in your library (provided they are from a supported storefront).