"Can i get the admin file from the update and reload it?"
Yes.
"When i do an update to the newest update do i need to go through all the past updates or can i just update the newest files?"
The newest files.
Please examine the file /includes/ckeditor/config.js, and determine if this line appears exactly as follows:
config.protectedSource = [/{\S*?.*?\S}/g];
If so, then this could be related to #3573, where a meta tag (well, possibly others) has been determined to be illegal. But I do think script tags are legal.
If not, then review the Github issue #3427.