There are just few bug fixes in this release and we're heading to 1.28.0, though there are still some rough edges.
You are downloading Gammu source code. To compile it you need some development environment for your platform and CMake tool to configure the sources. There are also some optional requirements for additional features which are listed in INSTALL file in sources. This file also contains more detailed instructions about compiling Gammu.
Tento archív obsahuje utilitu Gammu, knihovnu libGammu a Gammu SMSD.
You are downloading Gammu installer for Windows. There is 32-bit version, 64-bit version and 32-bit version compiled with MSVC 9.0 to be compatible with Python 2.7.
Pro spuštění Gammu budete možná potřebovat i Visual C++ Redistributable Packages.