boot.src.uimg

last time I figured out that there is no boot.src.uimg so my installation of arch linux was failed. However there is no line in install.sh to download boot.src.uimg. I thought it was in the ArchLinuxARM-chromebook-latest.tar.gz but in this another tutorial for sumsung chromebook boot.src.uimg is downloaded as another process. I'm confused why this install.sh script doesn't contain the line to download boot.src.uimg.
Anyway adding the line to download boot.src.uimg might solve this problem.