When you turn on your Cricut™ machine, the display will show which firmware version is currently loaded on your Cricut machine. Sure Cuts A Lot requries version 1.1 or 1.3-1.35 for Cricut Personal machines; version 2.1 or 2.3-2.35 for Cricut Expression/Cake machines; version 1.51-1.54 for Cricut Create/Cake Mini machines.
Right now, the only way to do this is from a Windows machine (XP SP2/Vista) by using ProvoCraft's Cricut Desgn Studio™ software or via a Gypsy. They have a free trial version of Design Studio available for download which you can download and use to update the firmware on your Cricut™ machine.
The license for our software is a single user license, and entitles that single user to install the software on a second computer of the same platform for which the license was purchased for, provided they are not both used at the same time, or by more than one person.