how to flash this costom rom

i flashed roms alot using sp flashtool which is scatterfile....... im trying to flash this costom rom. but i cant because the boot file is a disk image file. how can i flash this rom. its not boot.img its boot and its says on the right disk image file. no flash tool is able to reconginze it. even when i backed up my stock rom . it does nor say boot.img its just boot disk image file.


Please help if you know