Quote:
Originally Posted by Gunnerp245
I did not uninstall 0.8.1, but instead installed 0.8.3/4 in a separate directory. calibre uses QT5 but I have no issues with it. 
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I would recommend uninstalling the old version to be sure. Even though they're installed to two different locations, they're still sharng the same config directory in AppData/local. If you want to keep two separate versions installed, I'd suggest using Portable versions only.
Also ... the Qt5 that calibre distributes is custom-compiled (and I don't think it's yet based on Qt 5.4 -- but I could be wrong). Sigil distributes the available precompiled versions of Qt 5 with its releases.
Cool. Might not be 'til I'm home a little later, though.
Edit: PM with link sent.