First, in the documentation on the main readme, the comments say to specify "arm" if you want to pull down the arm release. This needs to be "armhf".
export ARCH=amd64 # can be 'i386', 'amd64' or 'arm'
should be:
export ARCH=amd64 # can be 'i386', 'amd64' or 'armhf'
Second, once downloaded and installed (with no issues), no matter what arguments you call, "scw" returns one line "Illegal instruction" and that's it.