To download and extract:
https://imagemagick.org/archive/ImageMagick-7.1.1-15.tar.gz You can also find it on GitHub (if mirrored), but the official source is the ImageMagick archive: imagemagick 7.1.1-15 tar.gz releases url
https://imagemagick.org/archive/ImageMagick-7.1.1-15.tar.gz To download and extract: https://imagemagick
Here is the direct download URL for ImageMagick 7.1.1-15 as a tar.gz source release: imagemagick 7.1.1-15 tar.gz releases url