I can't update all apps in iTunes 12.3.1.23 in my Mac (El Capitan). Have to do it one by one and sometimes it gets stocked processing the file.
When checking updates for the apps I have in iTunes, sometimes when hitting the Update All Apps, nothing happens.
I have to go and update one by one.
Sometimes once it downloads the updated app, it gets stocked processing the file.
I am using El Capitan as my OS and iTunes 12.3.1.23
iMac (27-inch Mid 2011), OS X El Capitan (10.11.1), iTunes 12.3.1.23