Download for Windows
calibre works on Windows XP, Vista and 7.If you are upgrading from a version older than 0.6.17, please uninstall calibre first.
Windows installer
(Version: 0.6.37 Changelog)
Note
If you are updating from a version of calibre older than 0.6.17 on Windows XP, first uninstall calibre, then delete the C:\Program Files\calibre folder (the location may be different if you previously installed calibre elsewhere) and only then install the new version of calibre.