Yet it half-way installs on 19.04 without a check, and your download page does
not include any warning of what it will do to your system if it's not 18.04. In
fact, the sub heading lists 18.04.2, so is that the only version of 18.04
supported?

>From the specificity used, it's reasonable to assume that the listed version
was a minimum version, not an exclusive version.