Editor hanged ! HELP needed

Hello

i tried to use free version of CKeditor to test it but it doesn’t work for me

after installation and activation , when i tried to post a new content
, i saw that the default WordPress editor removed without any new
editor , currently i don’t have any editor !!!

What is the problem ? could you please help me ? it seems that the editor hanged !

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My CK editor version : 4.5.3

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WordPress installed version : 4.3

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theme which i used : Pin = Grid Personal Magazine / Front-end Submission

https://themeforest.net/item/pin-grid-personal-magazine-frontend-submission/10272975?WT.ac=search_list&WT.oss_phrase=&WT.oss_rank=17&WT.z_author=An-Themes