Nevermind on the guide. You just drag and drop the file after mounting the sd card to a computer... You can also alternatively download it straight to the phone using the phones browser and then use a file manager to put it into the correct part of the sd card. By default files are downloaded to the download folder of the sd card (/sdcard/download/) but it needs to be in the root folder for this to work (/sdcard/). reboot into recovery (hold down Volume down and press power) and follow prompts and you're good.