Pages 5.6.1, Numbers 3.6.1, and Keynote 6.6.1 for Mac
Apple has released maintenance updates for its trio of iWork apps for the Mac — Pages 5.6.1, Numbers 3.6.1, and Keynote 6.6.1. The releases fix bugs in Pages and Numbers that prevented Microsoft Office documents from opening, resolve an issue in Pages that prevented use of Look Up for words in lists, and fix a problem with Keynote presentations that feature links on master slides. All three also receive the standard set of undocumented additional bug fixes and stability improvements. ($19.99 new for Pages, 224
MB; $19.99 new for Numbers, 166 MB; $19.99 new for Keynote, 456 MB; all three require 10.10.4+)
I have been trying to update for D-A-Y-S now and all I get is an error dialog box "Can't load data from Apple Software Update Server" - JJEEEEZZZZZ I have no clue what to do and have searched online for solutions with no luck on any recommendations provided (non-Apple supplied).
You might try signing out (Store > Sign Out) and signing back in. Sometimes that fixes inscrutable problems with Apple's online services.