Can't install 10.10.4 update
(Mac Pro, late 2013; 3,7 GHz Quad-Core Intel Xeon E5, 250GB HDD SSD)
App store udate tries to download files but after a second it stops and does not proceed with installation - update button is still there.
Tried with combo update file but the same thing here. It shows installation progress bar for less then a sec and skips to the end (with no result in update). There's an information that further installation will be proceed after restart but it doesn't give any result.
Any ideas what to do with that?
Mac Pro, OS X Yosemite (10.10.3)