v7 is live so this page is no longer useful, but kept for posterity.
Now testing Virtualmin v7 and a few fixes:
Both the Virtualmin installer and the WikiSuite installer rely on https://github.com/virtualmin/slib/ which is usually downloaded from https://software.virtualmin.com/lib/slib.sh
To test v7, you get latest release https://github.com/virtualmin/slib/releases or from master: https://raw.githubusercontent.com/virtualmin/slib/master/slib.sh