I have bought the pro app on my OnePlus 5. I have an old Samsung Galaxy S3 on my bike logged in with same Google account as my OnePlus. I have tried several times to delete the app reset the phone and reinstall but no luck. I can see the pro-version purchase in my Google purchase history, but the s3 won't unlock pro features.
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If you purchased the separate RaceChrono Pro app, then Play Store will let you install it for free.
Read more http://racechrono.com/article/faq/1499