Why the resistance to registering?
The great god that is Apple is giving you the software for free so why not give them a little something in return? You do need to recharge your personal RDF from time to time. The stupid GUI provides you with an ideal opportunity to say a few prayers at the church of St Jobs.
Of you could gearch on Google for 'OSX 10.10 download'. I'm sure there are a good number of sites who will gladly supply it for you.