Transferring files from free introductory to Pro

How do I transfer files created on the free introductory Sketch Up to my new Pro subscription? I’d rather not have to recreate the plans.

Which free introductory version? If you were using the 30-day trial any files you created would be on your computer where you saved them. Nothing to transfer.

If you were using the free web version you can download the files from your account to your local storage in your computer, there you can open them with the pro desktop version.