can't update iWork programs

Actually, that isn't enough information for anyone here to help.

Describe in detail what is happening. Describe the steps you have taken to resolve the issue yourself. Post screenshots of any alert windows that appear or pop up. Be sure to block personal data before posting the screenshots.

Mac mini, OS X Yosemite 10.10.3, Apple Watch, 38 mm silver AL, Watch OS 1.0.1, iPad Air & iPhone 6 Plus, iOS 8.3

I got the problem few day ago that iWork programs like Pages cannot be downloaded and updated. After update the billing info. for the Apple ID. Things solved.