If you have important .skp files from 2014, here’s how to future-proof them:
Trimble discontinued sales of SketchUp 2014 shortly after releasing newer versions (2015, 2016, etc.). The company now operates on a subscription model via (annual or monthly) and offers a free web-based SketchUp Free version. This means: sketchup 2014 serial number and authorization code
If you still have access to the email address used for the purchase, you can use the SketchUp License Manager to retrieve your active credentials. If you have important