Redcore Linux Hardened 1803 codename Jupiter is now released, and as promissed, upgrade from older installations is possible and supported (limited to binmode (vasile --binmode)).
sisyphus update
eselect profile set default/linux/amd64/17.0/hardened
emerge -av1 --nodeps vasile
vasile --binmode
sisyphus upgrade
sisyphus remove-orphans
This will take a very long time, since all packages will be replaced, so a fresh installation may be desirable.
sisyphus update
emerge -av1 --nodeps vasile
vasile --binmode
sisyphus upgrade
sisyphus remove-orphans
sisyphus mirror set 1
This will take less time, so if you already have Alpha installed, you don't need a fresh install.
hybrid (vasile --mixedmode) and/or source (vasile --srcmode) installation upgrades are unsupported since they may contain extra software from Gentoo portage tree, software that is not in Redcore's repositories.