To install them is first required to set-up a new update center. From SNAP, go to tools/plugins then click on the Settings tab and press the “Add” Button to add a new update center. Put the name of your choice and http://step.esa.int/updatecenter/experimental/otb/updates.xml.gz in the URL field. The OTB Adapter will appear in “Available plugins”. Select the module and press the “Install” button to install them.