README.txt v1.1 12/21/2004 cast a series of spells by pressing one button multiple times README.txt default UI DUF d2005.10.06_i1700_r01 10/6/2005 A colored, semi-transparent bar that overlays a region of the target health bar, showing predicted eviscerate damage. README.txt image v1.1 10/06/2005 displays estimated time to level and XP/minute in a movable frame

Each mod comes in a zip file that includes path information relative to your '$WoW\Interface\AddOns\' directory. You can place the zip files in that directory (create it if necessary), and unzip all files restoring path information.
For instance, if you have WoW installed in 'C:\World of Warcraft', you want to put the zip file in the 'C:\World of Warcraft\Interface\AddOns\' directory. Unzipping it with path information will create the 'C:\World of Warcraft\Interface\AddOns\CastAway\' directory, as an example, with all the right files.