As shown in picture, app store tell me to update iTunes 12.5.1, but in updates installed list, you can see I have already installed iTunes 12.5.1. But actually, my iTunes version is still 12.4.3 Now, I click the update button of iTunes, then after download completed, nothing will install, and return this page to wait update. My mac os x system is 10.11.6
How can I fix it? Thanks