The short answer will be “nowhere legal”, or it almost certainly does. As far as I remember, 2.10 were released in 1987; Products 2.10.03 (Unix) and 2.10.06 (DOS) were probably released either in 1987, or perhaps already in 1988. As you already know, this is seriously the antique software you are asking for.
If you're really lucky, you can find someone who still has the software, but you are really lucky to find it at all.
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