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Sir i am not able to apply the filters in photoshop 7 version and there is no OK button specified & the space for the button is left empty let me know you that i am using the demo version of the plugins which i had installed first time on my PC plz solve my problem

I assume that you are referring to the Plugin Galaxy demo. The removed OK button as the demo protection, only the PopArt and Zoom plugins have them, because they are free. The full version has the OK buttons.