is a file called "patch_1506_to_1525.rar" of 36mb
this contain all the patchs from 1506 to 1525 on 1
what you just have to do is
Install Knight online
open patch_1506_to_1525.rar and extract to your folder of Knigh Online which should be C:/program files/Knight Online
remplace to all after it open Option.exe
and there should say "1506" then change it to 1525 and click on Contents of the Update then that shit about " would you like to apply the values to the registre?" and put " Yes " then click where says save changes and start
this might be usefull when you reinstall your ko.