Hi,

Unfortunately you can’t use an external ImageJ folder to work with Icy.
That is something we tried to work out but that is definitely not easy to do. We will give another shoot on this but in the meantime you can indeed copy content of your ImageJ into the ij folder of Icy (note that it supports only ImageJ, not Fiji which bring majors changes to ImageJ).

Hope that helps.

– Stephane