I've never had to restart my PC either. What I do have to do, after clicking on the "X" in the upper right-hand corner of the program, is to then right-click on the calibre icon in the system tray at the bottom right hand corner of the computer screen and select "Quit" from the popup menu. Then I'm able to install the update with no problem.
Last edited by WT Sharpe; 12-20-2012 at 12:56 AM.
Reason: Added "from the popup menu."
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