That tar link (first one) do I download it into a usb and try and boot it into this Nuc?
The other one all look German to me..I am too new to this..all I know is download into usb and boot onto my nuc and that's it..
The ssh and all that is alien to me and after all these years now I am terrified I cannot just use my usb as everything changes and its complex and alien to me..lord help me I love my libreelec..
You need a working LibreELEC system in order to install a test build. If you are starting from scratch, use an official LibreELEC disk image to create a USB disk installer and with that a working system on your SSD/HDD. Once you have a working system, install the test build by copying the tar file into your Update folder and reboot.
so you need to download the libreelec AMD / Intel / nVidia – LibreELEC burn to usb using the image creator, when installed, copy tar to update folder.