Proinsias, a chara --
I can't help you directly, as I'm a Mac user
, but as a "last resort" suggestion (when you've tried everything else), you might consider keeping an older version OS on a separate partition of your hard drive and boot into
that when you need to use an older, no-longer-supported app.
Obviously, it'll be easier if someone can suggest a workaround for you so that you can continue to use it in XP.