Version for Windows 32-bit
A 32-bit version is usually suitable for all Windows (including 64-bit ones).
If you have a new 64-bit Windows and 32-bit software works incorrectly, try to run it in a compatible with Windows XP SP3 mode or download and install the 64-bit version of the application (if it is represented below).
Version for Windows 64-bit
The 64-bit software will work only on the computers with 64-bit Windows.
It's advantage is in using the 64-bit addressing, which allows application to work more stable and to use computer system resources with Windows x64 more optimal.DOWNLOAD Calibre 3.35.0
66.9 MB (installer MSI)
Portable version for Windows
The portable version doesn't need an installation and can work from any carrier.
Besides that, the portable version doesn't leave any "trash" in the Windows system registry, so it is the most convenient and recommended for skilled users.DOWNLOAD Calibre 3.35.0
55.8 МБ (portable / SFX)