Download and installation

Download Fldigi, Flmsg, and Flwrap here (free, all platforms): http://sourceforge.net/projects/fldigi/files/

Notes:

The files are platform specific and the file to be downloaded depends on operating system. Windows: exe, Mac: dmg, Linux: tar.
New software versions can be installed alongside older versions. Each version (including maintenance releases) is installed in a separate directory. This means a lot of versions can accumulate on a system. Uninstall old versions when a new version has been fully tested.
Installation structure:
Fldigi version 3.23.20 will be installed in: C:\Program Files (x86)\Fldigi-3.23.20
Fldigi version 3.23.21 will be installed in: C:\Program Files (x86)\Fldigi-3.23.21
Flmsg version 4.0.1 will be installed in: C:\Program Files (x86)\flmsg-4.0.1
Flmsg version 4.0.2 will be installed in: C:\Program Files (x86)\flmsg-4.0.2
Flwrap version 1.3.4 will be installed in: C:\Program Files (x86)\flwrap-1.3.4
Standard user accounts: if you logon to Windows using a standard user account, you will need the administrator password to install these applications. Unfortunately, the installers place the shortcuts under the Start Menu and Desktop for the administrator logon. These can be moved to the appropriate locations for all users however, the shortcuts will not be automatically removed when uninstalled.