Even after installing the newest firm- and software, Music will play over my computer

Hello,

as I have still have a problem with Mac OS High Sierra and rekordbox, I was wondering if anyone can help me. 

So: As I was having the same troubles like many of you guys after I upgraded to MacOS High Sierra (ver. 10.13.06), I took an approach to fixing it. First, I deleted rekordbox off my Macbook, downloaded and installed the firmware for DDJ-RR, and finally downloaded the most recent version of rekordbox. But still I keep on getting following notification (for better understanding  I took a picture form the internet as my computer is set to German):

If I now open my setting preferences on my Mac, there is no way for me to accept the installing of any drivers whatsoever. I am still having the same problems as before: The music won't play via the Output on the DDJ-RR and the DDJ-RR is not listed in the output options in rekordbox. 

Also, even after reinstalling rekordbox, all my songs are automatically saved in the "collection" in rekordbox, which I thought was weird. 

I have worked through all the necessary steps provided by Pioneer in their provided description regarding problems with rekordbox and High Sierra, which is available online. 

Maybe I'm doing something terribly wrong?

Thankful for any help!

Simon