Hohoho well it looks like alot to download but heres the stuff in detail:
Visual studio 2010 can be downloaded by just googling. Microsoft site gives u visual studio for free. U can download the vsx86.exe file or the .iso file. The iso file is a full version. The exe file takes files from the online site just lika a downloader or a torrent.
Next, Mysql. I had problems with the latest mysql so i stuck with mysql 5.1 just google this too.
Next, Git is a huge headache if ur new to all that. If u want to be simple in ur work, just download tortoise Svn.
Then go to the. Kro download link from tutoriala nd download the latest. KRO client, then u can either download the kro rsu lite version from that site or download miruku's one.
Now once thats downloaded, click the exe set the destination of ur gravity/ro folder. Now go to any drive(c:,D:,) wat ever and then create a folder called rAthena and right click on it.
If u had tortoise svn installed as i said before, there will be an svn checkout button. Click on that and change the URL.
The url mist be the same as the server files repository link given in tutorial. now that ur done with that, just follow his guide as usual.
lol i should make this a seperate topic lololol.