To download SparkChess Premium for Windows or Mac OS X, please enter the email address you used when you purchased it and the Transaction ID you were given afterwards. If you bought SparkChess from another store, you must download SparkChess from there.
The latest version is 10.5.2, released on September 25, 2017. If you own a previous major version (9.x.x, 8.x.x, etc.), you will download that one – please consider upgrading! If you are not sure what version of SparkChess you have, please read this.