WorldWideImporters Full OLTP Database
Be sure to download the OLTP version of this database backup and - for easiest access - to your SSMS backup folder. If you are unsure where this is, simply start to do a database restore (right-click Databases in SSMS Object Explorer) to find the correct folder. Save the backup there and SSMS will not have a problem with access.
Click on WorldWideImporters Full OLTP Database to open the resource.