[Pharo-users] Why do downloads not use HTTPS by default?

Today I visited https://pharo.org/gnu-linux-installation-64 to download the zip file containing the executable. To my surprise, the download is not carried out over HTTPS. The download link is http://files.pharo.org/platform/Pharo6.1-64-linux.zip. I ended up downloading the zip file using https://files.pharo.org/platform/Pharo6.1-64-linux.zip. The point is: if HTTPS downloads are supported, why is it not the default on the download pages of the Pharo website?