If you want to get rid of all of registries left on the program removal and don't want your Windows system is fill with redundant registries that someday may affect the system performance, you should perform a registry scan and clean with a sophisticated registry optimizer, it will help you clean all the useless and corrupted registry files on the system.
Some addons are standalone, and are able to run without any additional addons being installed; others can require certain other addons to be installed to work at all, or integrate with other addons to provide additional functionality. Collections of addons that have been put together to form a coherent user interface are sometimes referred to as UIs.
Edit: the version from wow-curse seems to be a trial. To get the real one u have to download it from http://wow-pro.com/. Then u will not find un unzip or extract all option, but u get a link further on their page to a windows page that informs u of 2 ways to unzip. So i learned that u can also unzip by double clicking on the folder. For certainty i double clicked on every folder i could find, and then put the whole bunch into interface/addons in WoW. And it works ok now.
If you are looking for some solid information on fast leveling in wow and you want to plunk down the dollars, you should take a look at Zygor Guide. One of the first great features you notice is that this guide is available for both Alliance and Horde while other guides are horde or alliance only. That's why Zygor Guide sets itself apart from the crowd. The absolute best part of the guide is the map add-on. Once you have loaded up the mapmod, it makes it very easy to follow along with Zygor Guides in a step-by-step fashion. You won't need to press alt+tab aveytime you need to find your next step or coordinate. Everything is inside your game.
A lot of different types of addons are doing exactly the same thing. For example, Cross Realm Assist was an cross realm addon but in fact it is an LFG addon with its own UI. Serverhop and WQGF were doing exactly the same thing from program logic perspective. Even Badboy as a chat filter addon would filter LFG spamming. The idea behind BlockChinese could actually be used for premade groups as well. There is no point for people to install so many different addons for doing the exactly the same thing. These features should share the same code base and work together.
I recently decided the whole "make gold" thing is awesome...but I can't seem to wrap my head around what makes a good deal and what doesn't. After trying my hand at a few auctions I decided to do the zygor guides for leveling and rep and everything that's included (pretty cool so far...but if there's a free option I'd like to have that). Well they have a goldmaking guide. It updates data like TSM and tells you what is supposed to be the best deals to farm or whatever...well the best deal it was telling me was 8800 volatile fires. It was supposed to be an amazing deal but come on....8800 volatile fires?
Anyway I will go ahead & download the Twitch app like everyone's saying, but I still need to know whether my in-game addon settings will carry over automatically, or whether they'd return to default same as if they'd all been uninstalled in the curse client then reinstalled from scratch. Because if it's the latter then I will have to take screenshots of the settings on all my toons BEFORE I install the addons thru the Twitch client.