I think this is the only way to do it—uninstalling and reinstalling:
Actually, uninstalling and reinstalling just isn't difficult with Creative Cloud apps.
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You don't need to remove your US version of InDesign CC17. You basically go to the Creative Cloud menu switch the language to "English يدعم العربية" then download InDesign CC15. This way you will have both applications running simultaneously if needed. Don't forget to switch your CC language back to English after downloading the Middle Eastern version of InDesign.
By the way, it is better to "Place" the Word document with Arabic content into your InDesign ME version instead of Copy & Paste, this way InDesign streamlines the text through its MS. Word import filter.