can't save render file

[ctob2]

When I click 'render' for render to d3, I get an error saying 'spreaD3_v0.96.jar (No such file or directory)'

A few months ago when I used spreaD3 it did work, so not sure what the issue is now. It does seem that the program now isn't 'seeing' within some of my files on my MacBook (OS Catalina) , as at the file upload step, it can only see inside the dropbox folder, and not documents on my computer.

Any advice extremely welcome.