Dear all,
while the best way is to use an iso, you might have situation like an hosted machine where you do not have the opportunity to access the hardware, do not have the choice of SME in the available distro, and not sufficient ressources to use a virtualisation distro and put SME on it.
see
https://wiki.contribs.org/Centos2smethis is still beta test time. so feedback are welcomed, and pleas use this only on a fresh install !