Looks like 2016 will hold a lot of script breakage and rewrites:
I'm already noticing some weirdness with sed not working at all like it should on my N7 2013.
su -c "ln -s /su/xbin/busybox /su/bin/sed"
I have also uploaded a fix for adb+fastboot Installer to the OP. I found that the HOME=/sdcard override on the adb command line wasn't necessarily working, so I added it into the wrapper script as an export command instead.