Quote:
Originally Posted by Marcus303
Trying to upgrade to version 2.20 64 bit in windows 8.1 I am being prompted for a password. I have never set or used a password in Calibre and have upgraded numerous times. Can anyone offer assistance?
Thanks 
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MALWARE, not Calibre or are you no longer an 'Administrator'?
You need 'Administrator' rights to install (upgrade) Calibre (non-portable)