Difficulty in updating
1. I have 1 update notification on my Mac, namely i Books Author. I click on the update button, but all I get is the spiral sign. I've left in running in the background for 15 minutes. Still no luck.
I note from my Mac Air that Yosemite has an update as well as i Books Author. These I successfully updated with no problem.
2. The update for OS X is not displayed on the App Store on my Mac. Whilst checking for updatesI get another spiral which continues without displaying available updates. All Apps are not visible in the App Store.
3. I re boot the Mac... Apps Store displays OK with i Book Author available as update. No luck updating. Checking for updates returns the situation as mentioned in para 2.
Help/advice would be appreciated. However I add that I'm not technically minded.
Thanks in advance.
MacBook Air, OS X Yosemite (10.10.1)