There is no ID 8. If you have the latest version of InDesign CC 2015 (version 11.1 is the current number), you can open up any earlier version.
It's possible that you have an InDesign CC file which incorrectly gave the version number, a bug that was subsequently fixed.
Try opening and see if it works or you get another message.
this says it's 8.1 version. is that windows? and why won't it open?
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On Thu, Aug 13, 2015 at 3:38 PM, Steve Werner <firstname.lastname@example.org>
InDesign 8.1 is the subscription version of CS6. It should certainly open in CC.