Sdkbox missing on upgrade from 2.3.4 to 2.4.3

I am trying to upgrade the cocos creator version of my project but sdkbox seems to be missing after the upgrade. Its not present in Build properties (sdkbox checkmark that used to be present in 2.3.4) and neither present in Extension tab in menu of cocos creator. I tried to reimport it from Extension Store then it shows error “Package Already Exists”. Please note that I am able to use sdkbox in my other projects which are using 2.3.4 version so sdkbox is there . What am I missing here?

Solved through this link , SDKBox in Cocos Creator Update issue