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When Christmas Day hits, a bunch of people are going to open up brand-new Xbox or PlayStation consoles, plug them in, and wait for gigantic system updates to download and install. Depending on how many eager gamers sign on to Microsoft or Sony’s services to grab updates—or play brand-new games—this process might take longer than usual if either company’s servers are feeling strained.
Thankfully, you don’t have to download multi-gigabyte console updates at the same time as everyone else. You can actually download the latest version of the system software for Microsoft and Sony’s consoles right now.
More at link.
I just downloaded it to hopefully stave off needing to make an update on Christmas, and it's pretty straightforward.