Original sentence: The purchased version will only work on one computer and operating system.There is a free demo version available, but most board sizes can only be played from the purchased version, and records can only be submitted from the purchased version
Edited sentence: Most board sizes can only be played from the purchased version, and records can only be submitted from the purchased version.The purchased version will only work on one computer and operating system, meaning that the game will suddenly stop working and have to be purchased again, next time you upgrade your computer