Downloaded add-ons into wrong folder
 

I setup Minion wrong at first and now have it setup correctly but the add-ons I previously downloaded aren't being shown as downloaded but when I search for more it says they're already installed. How can I download these add-ons?

I'd manually copy the addons from the wrong folder (the one you've setup first) and paste them into the new folder.
Start Minion afterwards and they should be shown then.

If not:
Try to uninstall minion and re-install it.

Or maybe it would be enough to delete/rename the minion.xml file so it will be rebuild as you start Minion.