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If you previously purchased a license for SketchUp Pro 2014, you can locate your credentials through the following methods: Confirmation Email : Search your inbox for an email from sketchupmail@sketchup.com
Even if you find a legitimate license for SketchUp Pro 2014, consider these downsides: sketchup pro 2014 serial number and authorization code
Do you still have access to the used for the purchase, or are you trying to recover the codes from an old hard drive? If you previously purchased a license for SketchUp