i think theres possibly a typo on the UR server 2.1.4 if your a client to a server either 2.1.1 / 2.1.2 / 2.1.3 / 2.1.4 will do.
there are specific reasons to choose a certain cam versions (server minimum type etc etc) but for most thing just choose 2.1.4 (or 2104 i think is the same)
i`m no expert, but theres meant to be security flaws in certain versions (i think 2.1.2 had a big one) and some servers demand a minimum version number, i.e. clients must use 2.1.3 oe above for instance.
but to be honest with you for small hobbyist`s i think near any will do, dont see much use of 2.1.2 though.