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You can install InDesign CC 2015 but it won't open your projects.
Ok thank you
There are two possibilities in this case:
1. Install InDesign CC 2015 to use the third party plugin (PageFlex). You can install older versions as well with your CC subscription. However backward compatibility can be a bump in this case. IDML can be a workaround.
2. Wait for PageFlex to roll out an update which would be compatible with InDesign CC 2017.