Program QIPSpeller was made to check the spelling in QIP. It`s not the plug-in in usual meaning. These separated program finds in computer memory QIP and build into it. During this operation it doesn’t change any QIP file. If you want to uninstall QIP you need simply to delete the containing folder. This way you don’t have to reinstall QIP.
By default QiPSpeller is made for Russian language, but it can work with any other language.

Download QIP Speller