This is somewhat controversial because it is against the Apple EULA, but apparently you can save 0 if you’re a Tiger 10.4 user and run the 10.6 Snow Leopard upgrade without a problem.
To make things even more interesting, popular Mac writer Walt Mossberg actually recommends that you do this if you are a Tiger user.
The fact that you can save a lot of money by upgrading directly from 10.4 is a huge bonus.
Product datasheet Upgrade Price Guarantee Compatible with Windows 10, 8.1, 8, 7, Vista and XP, 32 Bit / 64 Bit Editions New language versions: Chinese - Lithuanian - Japanese - Polski - Romanian - Spanish - Czech Update Star is compatible with Windows platforms.
Update Star has been tested to meet all of the technical requirements to be compatible with Windows 10, 8.1, Windows 8, Windows 7, Windows Vista, Windows Server 2003, 2008, and Windows XP, 32 bit and 64 bit editions.
Simply double-click the downloaded file to install it.
Update Star Free and Update Star Premium come with the same installer.