Zurich International Airport (ZRH/LSZH) is a FREE study level airport?

[dxtr]

It is a handcrafted airport free as part of the GOTY Edition.
There are many more, you can find a list here:

[GUIDE] Asobo Handcrafted Airports | MSFS 2020

I spent a long time searching for a simple list of official handcrafted airports and frustratingly all I could find were fragmented snippets of information scattered all over the web, mostly dating back to the initial release. Having hit this brick wall I took it upon myself to make one in the hope it would help others looking for the same thing. These are, to the very best of my knowledge, all the Hand Crafted Airports released thus far by Asobo. I’ll endeavour to keep this updated after each …

The quality is ok, but real payware is often even more detailed.