Downloads
Source Code
Source code of Tesseract’s Releases.
Binaries for Linux
Tesseract is included in most Linux distributions.
Binaries for Windows
Old Downloads
Downloads Archive on SourceForge. There you can find, among other files, Windows installer for the old version 3.02.
Currently, there is no official Windows installer for newer versions.
3rd party Windows exe’s/installer
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Cygwin includes packages for Tesseract.
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UB Mannheim has installers available for current (5.3.0) and older versions.