As time goes by, I think it is increasingly unlikely that an update will be forthcoming.

I'm still here as official support but I'm neither the author of Juicebox nor the person making the decisions.
As such, I've not heard any official word on the future of Juicebox.
Having said that, I've been pushing for an update behind the scenes for a while now (with suggestions and code) but I do not know if anything will come of it.

I'm sorry it's not better (or more certain) news.
In light of this, I'd understand if you wanted to migrate to a different web gallery program.
Thank you for your continued support over the years.