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Hi, Welcome to JustAnswer support, thank you for utilizing our service.I will do my best to help you out in fixing the issue you are facing.What is the error message you get on the ipad?
you must have purchased the windows version and not IOS mac version that is why you are getting this message.
Trouble installing Office on iPad device.
In order to install Office 365 on iPad, you need an iPad running iOS 7 or later. So ensure your iPad device meets the system requirement to install Office 365.
For more information you may refer to the section Install Office for iPad apps mentioned in the link below: