You should be able to install it...
Download the Magic Lantern from the link I posted earlier; its Unified Version. What Unified Version means is that it has the FIR files for different Canon cameras...that you need when you want to UNINSTALL. Think of Canon camera as some generic computer and Magic Lantern as an OS that you install and you have to uninstall it and then REINSTALL the "original OS" (i-e Canon's 600D Firmware) to go back!
ALWAYS DO THESE INSTALL / UNINSTALL WITH FULLY CHARGED BATTERY PACK!
There is INSTALL.PDF file in the zip that you will download. Read it!!! If you dont understand any point in that file...DONT INSTALL MAGIC LANTERN and instad use Canon EOS Utility and Laptop for Time Lapse. "You have been warned"