JD comes with an integrated Addon manager. This Module installs addons for you, and keeps them up2date.
Switch to→“Addon Manager”→“Installation &updates”
Select all addons you want to install.
Click “Save” as soon as you finished.
After Download of the addons has finished, JD asks you to install them.
The Webupdater does this job pretty good.
Probably JD will have to restart to complete the installation