Quote - I have B5.s and b6.0. and B6.1 and B6.1.13...whatever it is, and all of them work, and I just let them install however they wanted to.  It's always a good idea to save your presets before installing anything though, just in case.

I particularly like to have a B6 (insert extra numbers here) version as well as B5.5c, as that way I can try out things in the version without IBL as well as with IBL, in fact I'm just now doing some tests to see if using B6 with no IBL looks the same as B5.5 au naturel.
(as well as other lighting tests)

There what you said..I knew there was a reason for my obsession.