It is available from MS and free to download on their site - just search for it. There is a MS tool called Orca, which allows editing of MSI installers and it is part of Microsoft Windows Software Development Kit (SDK). I'm not sure that I can post here any links to external sources, so I'll describe the way I've installed Calibre 5.5 64 bit edition MSI installer on my Win7.

I don't want to go into more details or discussions why I'm staying on Win7 or whatever, but just want to share the workaround I've found for myself and that it works excellent for me, so if someone else wants to try on his own risk - below is the best solution for me. I'm sure there are still many people like me that for many reasons are staying on Win7 and in the same time want to use latest version of Calibre, which provides new features, fixes and etc. I wanted to post my findings in the thread 'Windows 7 compatibility excessive restriction', but it seems closed, so I couldn't do that. In short I've got here while searching for a convenient way to upgrade Calibre from version 4.23 to the latest 5.5 on Windows 7.

Just make sure that you keep the installer for your working version around until after you are satisfied that calibre is happy after installing the latest and greatest so you can back out of an update that breaks your system.First I'd like to say a big 'Thank you!' to the author and anyone who contributed to Calibre project for the great software! My advice is if it is working for you, don't worry about it. The fun in this is that as calibre incorporates newer releases of QT, there is a chance that your video card will be on the blacklist. The most common symptom is that when you open a book in either the viewer or editor, you see blank pages.

The issue that has come up is that QT has issues with some video cards/drivers. Is there something I am missing by not going back to 3.48? As long as the newest Calibre works seamlessly with Windows 7 SP 1, why should I revert to an antique version? I ignore this & continue to download Calibre new releases & updated third-party anti-DRM plug-ins. Whenever I get a message to update Calibre (I use 64-bit version 4.11.1), it warns me not to upgrade, but to back off to an old version of Calibre - 3.48. I use Windows 7 SP 1 & refuse to upgrade to that abomination, Windows 10.

Download calibre for windows 7