You can still install from the dvd without the live system, but first a couple of quick questions.
1) Is this systemless UEFI hardware, or was there an OS (Windows 8 or 10) on the disk? Live environment may not run at all if it is Windows 8.1 without changing some things in the BIOS.
2) What is the hardware? Look in the BIOS for system and hardware info and for enable system installation.
TC