Installing on Mint 20.3

Hi all, I am switching from my raspberry pi to a PC.  I had installed LinuxCNC on Debian 10 buster but could not get my Wifi adapter to work so I switched to Mint 20.3 and now I have my wifi working but I cannot install LinuxCNC.  i am following this forum artical LinuxCNC on Linux Mint 20 quick and nearly easy install  I get files not found error on the commands. are the links broken or is there a different proceedure to follow? 
 

   

Running LMDE 6 Faye with 6.6.0-rt12 kernel.

For new Kernel search 6.6 in forum.
Link                                          drive.google.com/drive/folders/1HceAcPQd...u4zS9?usp=drive_link

Debian 12 with this patch appears to be a bit more stable.

Thanks again for your support that worked brilliantly and seems to be more stable than Debian with 2.8