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July 29, 2019

Two branches of libmodbus are currently maintained:

development release v3.1.7 , released on 2019-07-31. See the release notes. This development version is very stable and will be marked as stable very soon.
old release v3.0.8 . See the release notes. Almost no changes since 2013-10-06, should NOT be used on new project.

Download the tarball of the version you want by clicking and the version numbers and run:

./configure && make && make install;

to compile and install libmodbus on your system.

The latest stable release is also available in many Linux distributions:

Archlinux
Fedora
Debian
Ubuntu
Buildroot
Fink

You can also browse the source code on github or clone with the command git clone git://github.com/stephane/libmodbus to compile and test the latest version.