I have Disk Warrior 4. The operating System on the disk is Tiger. But I'm now on Snow Leopard. I need to rebuild my directory as my wacom tablet stopped functioning (no clicking and tracing possible, highlights everything, sticks to links, etc. - I had this once and fixed it using Disk Warrior). Is there a way to still use this copy of Disk Warrior? There's an upgrade available, but it doesn't include Snow Leopard, which is necessary to repair your main disk - you computer boots from the disk in your drive. PS: Could I still boot using the Snow Leopard disk, and then scanning my main drive by using an installation of Disk Warrior on an external hard drive? edit: I just got a call from Alsoft support. The update you can get as a registered user updates the current disc. There is a bare bones OS on there that allows the computer to start up. Instructions on how to update the disc come with the update file.