I have the latest Virtualmin 6.02-3 GPL with Usermin 1.73.
Authentic Theme Update want Usermin 1.74 to update.
The error message says
“upgrade Usermin to the latest development version first using console, by running “update-from-repo.sh” script from its directory.”
Just to clear up some confusion. Webmin and Usermin get released earlier on Webmin.com, however before they are released on Virtualmin.com Joe tends to vette things a bit more, so there are delays between the two site’s releasing the same products. This process in part is a result of making sure Webmin/Usermin don’t break Virtualmin support, whereas on Webmin.com this isn’t a priority as Webmin/Usermin can technically be installed independent of Virtualmin when desired or appropriate. Cheers!