Devices not updating apps after upgrading to IOS 8.4

Try this:

Log out of the iTunes Store on your device:

Settings>iTunes & App Store...tap your Apple ID, then select "Sign Out"

Close off apps from Multitasking:

Double-tap the Home button which will bring up the running apps icons along with an app screenshot "card" above the icon. Tap-drag the app's -card- (NOT the icon) up and off the screen. Do this for all apps in the Multitasking bar

Reset your device:

Device Reset (won't affect settings/data/music/apps/etc)

1. Press and hold (& continue to hold) BOTH the Sleep/Wake button & the Home button.

2. Continue to hold BOTH (ignoring any other messages that may show) until you see the Apple logo on the screen.

3. Release BOTH buttons when you see the Apple logo and allow the device to boot normally.

After the device has restarted, sign back in to the App Store as above.

Hai the above sad process didn't worked for me.

I have already try lot of time this was not working for past one month for me.

Anyone has solution pls guide us??????????

I had this same problem and was able to fix it by reseting my iPad's settings...

Settings > General > Reset > Reset All Settings

Thanks! This fixed the same issue I was having.