My download from:

https://www.realtek.com/Download/List?cate_id=584

crashed.

maybe with a simple solution. but I'm having a hard time moving forward here.

root@fedora:/home/../Downloads/r8168-8.053.00# ./autorun.sh

Check old driver and unload it.
Build the module and install
make[2]: *** /lib/modules/6.9.4-200.fc40.x86_64/build: Datei oder Verzeichnis nicht gefunden. Schluss.
make[1]: *** [Makefile:182: clean] Fehler 2
make: *** [Makefile:48: clean] Fehler 2

I would be thankful for a helpful tip.