I've run into something similar on versions 4.1, 4.2 and maybe 4.3 each time I simply waited until I had reason to reboot my machine then installed calibre first thing after the reboot. Each clean boot install ran fine.
Quote:
Originally Posted by gazmacska
Calibre 4.3 64 bit installed (reinstalled) correctley. V.4.4 and 4.5 installation failed with unexpected error.. Tried to download with different browser and from different places, no success.
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As long as your "different places" are the alternate download sites linked from
calibre's download page you should be fine, but don't go hunting the web for other calibre downloads, they may not be safe.