User blog comment:Dragonjet/KC3改/@comment-27145607-20160410131635/@comment-1820055-20160424021303

on some cases, extension updating are sometimes blocked by chrome updating. So make sure you are on latest Chrome:

Chrome Menu > Help > About, and it will check for updates

After that you can try again. Also it might take some time because the app is 5mb, depending on your connection