I have tried to download an update from the AppStore for Yosemite 10.10.4 and unfortunately it interrupted.
Now I am in a situation where if I try the update again I get the following message:
Some updates need to finish downloading before they are installed.
If I confirm with Download & Restart it will tell me it is rebooting the computer but then et another message saying:
Available updates have changed
If I confirm that one too it will just go back to the previous message.
It is some sort of infinite loop.
I have tried updating through the Terminal with:
softwareupdate command but the result is the same.
Best Answer
Check your versions of Pages, Numbers & Keynote & make sure they're not updating in the background [look at Launchpad for the telltale thermometer] - mine updated to x.5.3 when I first tried updating to 10.10.4 & I had to wait until they were finished before the OS update would run.
If they are up to date, or at least not currently updating, then I'd get the combo updater & use that instead, from - https://support.apple.com/kb/DL1820