Crx4Chrome collected total 2 old version of crx files for YouTube Pro.
YouTube Pro Version History
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YouTube Pro v4.1.2 (Latest Version Crx File)
► Updated: February 9, 2018
► Require: Chrome 38 an up
• File Size: 56.63 KB
• MD5: d70409f0ba4ee6436aff53d1fe7acd07
• SHA1: e34c7c21964bb59200e4168e882d860b6f54e04e
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YouTube Pro v4.1 (Old Version Crx File)
► Updated: January 20, 2017
► Require: Chrome 38 an up
• File Size: 56.45 KB
• MD5: 726fb54ea65b3baa4d24d6ffbb603b3f
• SHA1: 29b8f2cf6521b5cb77c34d7b96b690016cb9895d