The sprite images do not have a version specified anywhere, but you need to make sure that you are always copying images together with the theme CSS files when uprading Kendo UI. In this way the CSS files will always be referencing the correct images.
Having three different versions of Kendo UI scripts and stylesheets in a single project is unnecessary, messy and unmaintainable. I recommend you to remove all Kendo UI scripts and stylesheets and take a single fresh copy of them from your Kendo UI installation folder.
Generally, there are two very straightforward and commonsense things that a web developer should do when some background images do not appear:
1. Check whether the CSS styles, which reference the missing images, are applied (if not, they may be missing or be overridden).
2. Check whether the images are placed at the location specified in the CSS code (if not, you will see 404 errors in the browser's console).
Any DOM inspector, which modern browser provide, will help you with these tasks.
Finally, if only the Editor icons are not displayed, while other Kendo UI widgets work fine, then the reason is indeed mismatching versions of the CSS file and the image sprite.
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