How to check if my license is 'original'?

How to cek my license original or no? please help me

If you are using SketchUp Pro 2018, it’s an original license. If you are using 2019 you can look in the Classic section of the manage license window, to see if there is the old style license there.

UA-0031 what this serial number original?

That is the start of a SketchUp 2019 classic license serial number.

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SketchUp License Manager

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