Search for the 16756 package for xeBuild GUI or JRunner, etheir one of those have the unofficial DL 3.12 that has been patched to work with 16756... as long as you install it with the builder it'll work, but nobody truly know what they've done, it might seem to work fine but might also be causing issues ppl haven't noticed...
Indeed, we never did intended to have ppl f*ck with xbox live, we update merely so that new games work and such... this particular update is quite useless for offline users, the only ones that would really benefit from our official release is those who go on xbox live to play modified games and such... and those with dualboots (it'd be slightly easier for them as they'd have the same avatar data for both systems...