Do you have the Creative Cloud app installed? Click on the settings "gear" in the upper-right-hand corner, go to Preferences, choose Apps, and then select "English (الشرق الأوسط)". Then when you download InDesign you'll get the Middle East edtion with English menus and controls for spine-right binding, kashidas, text direction, et cetera.
Thanks Joel! Adobe's online and phone support on this issue were less than stellar, to say the least!