What version of NPrinting will you be running?
In version 17, there are no designer (desktop) licenses. The purchase of the server license allows for an unlimited amount of developers (they will need to install NPrinting Designer locally).
From there, the developers design and preview reports using the Designer application, but the reports are executed and distributed by the server.
Yes, I talk about version 17.
I have installed v17 desktop on my laptop but I don't have the licence : I only have a licence for Nprinting Server
Should I ask for a Desktop licence number ?
And is the v17 working fine now ? last year when it was released all people at Qlik told me to stick to the v16 because the v17 was very bad.
If you are running version 17.2.1 or later, you should be OK.
You don't need a desktop license. Simply give yourself report authoring permissions in your NPrinting user role. See Security management ‒ Qlik NPrinting