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Had to reinstall my OS and after reinstall it says Cannot process Serial Number Validation for Photoshop Elements 13, on MacOS Sierra.
It cannot see an internet connection although it is connected and the internet is working fine.
You need to contact Adobe directly. You can initiate a chat session here:
Adobe Photoshop Elements Learn & Support
Or by phone:
Reach us by phone (adobe.com)
Have a look here: