You will need to install your own licensed copy of MATLAB.This will literally update and replace the existing, non-functional ImageJ.m file in the scripts folder with the genuine one.And then click Apply changes on ImageJ Updater.Once checking status is done, click Manage update sites.See Following an update site for more detail. MATLAB tutorial for ImageJ2 Prerequisites Allows developers to write additional plugins which extend these capabilities in new directions.Lets you launch ImageJ2 and interact with it from inside MATLAB.Enables execution of MATLAB scripts from inside ImageJ2’s Script Editor.Translates data between ImageJ2 images and MATLAB matrices.If you run MATLAB R2017b and later, you don’t need to do this, as it ships and uses Java 8 already. You will need to change your MATLAB installation to use Java 8, by following the instructions for your platform: Windows, macOS or Linux. Prior to MATLAB R2017b, MATLAB ships with Java 7, but ImageJ2 requires Java 8.