Open the Yoxos Install Manager (YIM) Perspective. Go to the drop-down menu Help and choose Software Update with Yoxos.
This will switch to the Yoxos Perspective which looks and works very similiar to the online service.
Note: If you are using an older versions of Yoxos the Yoxos Perspectiv can be accessed selecting Window -> Open Perspective -> YIM. Depending on the perspective you have currently selected, YIM may not show up as an option in the top level selections. In that case, select Window -> Open Perspective -> Other. Then choose Yoxos Install Manager from the upcoming window.
The Medium Explorer Window on the left lets you select the features.
Click the green arrow to add a selected feature to your installation.
The double green arrow icon selects all features at once (approx. 300 MB of download).
Click Start Installation to download and install your selected features.
On the top of the Medium Explorer you'll find four Buttons to ease the use of Yoxos.

Expand all expands the selection tree.
Collapse all collapses the selection tree.
Show only updates for installed features toggles the display between all features and those already installed but with a newer version available.
Hide already installed features displays only the uninstalled features.
Hide all features which could be autoselected toggles the display of those plug-ins that are selectable using the autoselect mechanism. These are mainly language- and source packages.
Update Yoxos checks for newer versions of Yoxos and - if applicable - offers you to update your Yoxos.
Select an Install Medium lets you chose an Install Medium other than the download site, like CD/DVD or a downloaded archive. Please be aware that the CD/DVD version can still be used if you need to, but they are discontinued and no longer updated or supported.