Well, if your theme is going to hit problems with the latest versions of WordPress it may realistically be best to look at updating it – whether via the official source (if there is one) or by asking someone to review it and make any adjustments that might be necessary. Or indeed replace it with something current and supported.
Beyond that, you can if you prefer grab historic versions of our plugins from our downloads page (and from this page on wordpress.org) … however please do note that the amount of support we can offer if you hit problems with an older version is going to be limited in the extreme – you’ll certainly be reverting to code with known bugs that have been resolved in our most recent releases.
I’m not really sure how many other avenues there are in this situation :-/
Does that help – or at least clarify things?