This is intended. Reaper of Souls hasn't been released yet, only the pre-expac patch.
It does contain a lot of the new features (clans, loot 2.0, revamped legendaries, new monster affixes, reworked bosses, paragon 2.0, etc), but things like the Mystic, Bounties, Rifts and the Crusader will only come on March 25th.
I am still unable to find any cursed chests.
I am still unable to access Adventure Mode.
This is intended until the 25th of March, right? There's nothing else I have to do on battle.net to upgrade/install after purchasing is there?
It does contain a lot of the new features (clans, loot 2.0, revamped legendaries, new monster affixes, reworked bosses, paragon 2.0, etc), but things like the Mystic, Bounties, Rifts and the Crusader will only come on March 25th.