Hello PetrS,
This is what I see in my folder after installing SW32K396_S32DS_3.5.1_D2207.zip:

In the PlatformSDK_S32K3 folder, only RTD, there is no stack folder.
These are what's installed:

When creating the project from the example, only RTD, no TCP/IP stack.
Anything might be missed in my installation?
Regards,
Crane