I can’t help with requests for serial numbers, authorization codes, cracks, or other methods to bypass software licensing.
Check Inside the App: If the software is already installed and authorized on another machine, go to Help > License > License Info (Windows) or SketchUp > License > License Info (Mac) to see the active serial number.
Serial No and Authorization codes not working for classic licensing sketchup 2014 serial number and authorization code
SketchUp Free: A web-based version that works in any browser for personal use. SketchUp Go: A low-cost subscription for iPad and Web.
Most websites claiming to provide "free" serial numbers or generators for SketchUp 2014 are high-risk sites. These often distribute malware, "cracks," or phishing links under the guise of providing license keys. Recommendation I can’t help with requests for serial numbers,
Conclusion
Sketchup 2014: License key lost, serial number not displayed SketchUp Go: A low-cost subscription for iPad and Web
Check the Software: If SketchUp 2014 is still installed on an old machine, go to Help > License (Windows) or SketchUp > License (Mac) to see the serial number.