@Resnick joy - Please go to Backend -> Extend - > Extensions ...
Then you will see a list of "Core extensions". Look within the "Core extensions" and you will see a table of data under the "Options" collumn please click the small arrow icon that points upwards.. This will automatically update the CKEditor for you.
Example below:
If you have any issues, Please screen shot the error message and also the page i have asked you to naviate to.