Hi Andreas, Thanks for the report. The package already depends on wget, which recommends ca-certificates, so this only affects users that have decided (against the recommendation) to not install this.
In any case, the expected retrieved file has a known checksum (the whole downloading dance is to avoid redistribution legal issues) so I'll change it to use wget --no-check-certificate and subsequently checksum the retrieved file. As long as the file is the same, we don't care so much who actually delivered it :) This solution should work for everyone, and in your case you will get a warning instead of an error. Regards, Tormod