June release was last stable release on x11 + Qt4 + qtcomponents.
No official release since then, as nemo was moved to wayland, all apps were ported to Qt5 and qtcomponents-qt5. Also glacier UI work started since then.

Though there are unofficial snapshots for N950/N9 and VM. There are links on Nemomobile wiki but those are outdated very fast. Uptodate stuff can be found on #nemomobile irc or by building an image yourself.