Hello Radek,
It sounds like you are integrating versions of Wwise that are listed as compatible with that version of Unity, so that's a good start! If you ever need clarification on what versions of Wwise are compatible with certain versions of a game engine, there is a Release Notes section in Audio Kinetic's documentation page that lists what versions of a game engine are compatible with certain versions of Wwise, linked here.
If the integrate button is greyed out, I believe there should be a message that indicates what is wrong, though here are some things I can think to check at the integration phase in the Wwise Launcher:
- The version of Wwise at the top, make sure it is the one you have downloaded and want to use.
- In the deployment platforms box, I would make sure to have the following boxes checked: Apple --> (MacOS), and Microsoft --> (Windows). I tried integrating Wwise without the Apple platform but it greyed out the integrate button. I am assuming these platforms need to be installed in Wwise as a default platform that gets integrated. Otherwise, it does not let you integrate?
- Make sure the Wwise SDK path is specified
Those are my thoughts. In the 301 certification, Lesson 9 guides users through integrating Wwise into a new Unity project, I will link it here.
I hope this helps!