It's a question of taking the time for reading the news. I just copy the extract of the news that concern your prob:
A 4.5 GByte ISO base NuTyX "fixed" version is available which contains a complete repository of the binaries for the NuTyX 11.2 release. You can install NuTyX 11.2 completely without having to use the internet. To install packages from this ISO, once your base system is installed, configured and booting, it's just a question of mounting the media on the /mnt mounting point.
Suppose you media is found under /dev/sdc1, use the following command to mount it:
sudo mount /dev/sdc1 /mnt
Change this command to reflect your system.
Good luck