Version 9 and plugins

Something about plugins is not clear for me.
You say ( forum.joomlack.fr/index.php/4-maximenu-c...nu-ck-v8-to-v9#55209 ):

List of plugins to uninstall
After updating your module you must uninstall the old plugins :

maximenuckparams
maximenuck_adsmanager
maximenuck_virtuemart
all the other Maximenu CK patch (joomshopping, K2) can be uninstalled

These old versions of the plugins do not work with the V9 (you can still use them with the V8 legacy mode)

WARNING : all these plugins are now part of the Pro version of Slideshow CK, because all paid options have been merged. Please use the Pro version if you need them. You can uninstall them completely if everything is working great with the Pro version after update

Slideshow CK: is it a typo?

Anyway I can't figure out how to use this plugins with the Pro version. In the Source tab, the Source of items dropdown menu show only Menu.
What am I doing wrong?

Hi
I have corrected the mistypo.
Of course you will only see what you can do, if you don't have any of the extensions Hikashop, K2, Virtuemart or others installed, then you can not select it in the dropdown
The option only appears if the extension is installed into your website
CEd

Strange circumstances!
I upgraded three websites and in no one of them any of these extensions was present. The ones with VirtueMart are still to be upgraded.
My fault.
Sorry.