From Blizzard
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Hi there! Game Master Aeldrinn here =)
I understand you were having some trouble with Warcraft III following an upgrade to your operating system. Let’s see if I can help explain!
I've looked into this, and it appears that title is simply incompatible with that version of iOS =/ We don't really have a way around that ... so my advice if you wanted to continue to play WC3 would be to either have a seconday operating system to boot to on your machine or to simply play it on a different computer with an earlier version. As a good rule of thumb with legacy titles like this, version 10.6 is a good milestone. Most will not work on any version after 10.6, so I'd recommed shooting for that as the magic number.
My apologies for the trouble, but I hope this information was helpful =)"