Ah, thanks for the clarification.
Of course, from a practical standpoint, that means one needs to compile and install 2.09 first--and web2c before that, most likely--since no distribution of which I'm aware ships both. If you have lots of older documents and need only to do a one-time conversion to PDF (for example), that may be the simplest approach. But in general I'd expect most people would find it easier to modify the document(s). ;-)
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