After you download it, just click on it and it installs wherever the heck it's supposed to - you don't have to tell it where! Click on it, reboot, then try it! It works!
Set at 1024 x 768, my tables are just under 10 inches wide (about 9 7/8ths) - I really don't think I'd like looking at them much narrower! :)
The way I intend to build my tables in future is to make a blank one at the beginning (turned on, turned off) that has a width of 775. That way, I can see how wide I can allow cellpaddings and not make anyone have to scroll if theirs is set at 800 x 600.