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The Addon Files are kept on the T: drive, at T:\Addons\, specifically 3.7 Aeon CRT Addon, AlmaPrimoCatalogSearch, and AlmaBarcodeLookup folders. If you do not have these listed, or the versions are wrong, copy these folders into your local Addons folder, which you can find at My Documents\Aeon\Addons\. Then, return to the Manage > Addons area, and make sure they appear and are active.
For the Printing Configuration, you will need to choose the "Printer Setup" option from the menu after clicking on the medallion (as above)
This is generally what you want to have, which is "Prompt" checked, but not "Edit." Prompt means that you will get to choose the printer the call slip prints to (usually desirable), while Edit means that rather than print the call slip directly, Aeon will open a word document to be edited before printing. This is usually a nuisance.
The one issue is that these Templates don't appear until you've used Print Callslip and Print Request at least once, so you'll have to do that before you can change the settings.