We can't say 100% without knowing the URL that you're seeing this from, but usually this type of error is seen when there is a cookie issue with Shopify. Switching browsers, or opening a private/incognito window should let you complete the install. Clearing your cache may also help to fix this error.
I'm getting a 400 error when trying to install the app on Shopify. Print
Created by: Rob O
Modified on: Fri, 31 May, 2019 at 9:59 AM
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