Yes, for D7100, ACR 7.4 is needed.
Do you get any errors when you try to update PSE 11 ?
@kglad : you can't download ACR 7.4 from that link
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thank you. that doesn't make sense but a lot of things on adobe.com don't make sense.
anyway, he can download directly from here: http://blogs.adobe.com/crawlspace/2011/03/keeping-photoshop-up-to-date.html#notconnected