Below are easy install instructions by OS and Architecture. As always there are always the standard instructions in the README.md as well.
linux
amd64 - linux
# Export the sha256sum for verification.
$ export IMG_SHA256="cc9bf08794353ef57b400d32cd1065765253166b0a09fba360d927cfbd158088"
# Download and check the sha256sum.
$ curl -fSL "https://github.com/genuinetools/img/releases/download/v0.5.11/img-linux-amd64" -o "/usr/local/bin/img" \
&& echo "${IMG_SHA256} /usr/local/bin/img" | sha256sum -c - \
&& chmod a+x "/usr/local/bin/img"
$ echo "img installed!"
# Run it!
$ img -h