Issues installing LinuxCNC

Hello,

I just installed my first Linux version on an old Thinkcentre i have laying around. Iam planning onbuilding a new CNC using LinuxCNC so I thought maybe I can and lear how to use it before i finish my CNC. Kinda just to get used to Linux.

So after like 2 hours I finally managed to get debian 12.10.0 running on my Thinkcentre. Then I started to follow the instructions on the LinuxCNC page.

I did the updates:
sudo apt-get update
sudo apt-get dist-upgrade

Then I installed the Preempt-RT kernel
sudo apt-get install linux-image-rt-amd64

everything worked fine. After the restart it selected the right linux RT version.

So the issue starts here.
 

If i click on the link for the linuxcnc-install.sh file it doesnt download anything. So where exactly do I get the script? Iam probably just to stupid to understand it.
Also chmod +x linuxcnc-install.sh doesnt work. I have even tried opening an txt.file and naming it linuxcnc.install.sh with the script from the browser. But still nothing.

Found another thread with simillar issue
$ chmod +x besnik/home/Downloads/linuxcnc-install.sh
Or better yet
$ cd besnik/home/Downloads/
$ chmod +x linuxcnc-install.sh

Always says No such file or directory.

Does anyone have an idea what I am missing I can already deel its something easy to fix I just dont see it. Kinda embarrassing asking for help