I can't remember the last time I updated my Test Center client, which puts me in a bit of a bind as according to @Asros the upcoming Big Update will be a lot bigger still, in terms of the resulting download, if the TC client isn't up to date. I don't have the fastest of connections, so that's not heartening news.
Which got me thinking: my live client is up to date. Might it not be possible, then, to replace the TC assets on my HD with the live files, yielding something approximating an up-to-date client? I realise that there are bound to be differences between the two versions of the game and that there'd doubtlessly be numerous files to repair/reacquire above and beyond the newest patch, but it'd still be worth it even if it gave me just a minor headstart compared to my current, totally antediluvian TC client.
Has anyone tried this before?