What is happening with Sabai Directory and Directory Pro?

I have been using the Sabai Directory products for a decade and the update and support have been incredible. Yet lately all links to the plugins and its author are not working anymore. And you cannot find them anywhere in Envato or Theme Forest. The plugins are important elements in one of my most important websites. Would anyone know how or where to contact the author? The name is onokazu.

I believe he/she is Japanese and I am in Japan, if that helps.

I have few clients using Sabai, I have checked it’s coding. To be honest, it’s a little bit out-dated.
https://help.market.envato.com/hc/en-us/articles/203039054-How-to-contact-an-author

Not sure if you’re able to get a respond from the author, it seems they are “not” available for some time.

Very kind of you to respond to this. Indeed the coding is outdated, but I was hoping that our directory can be migrated to his newer Directory Pro, which he claimed to have rewritten anew. Well this seems to be not a path now, and I need to find a way to easily migrate the content to another plugin.