The pidgin installer can be run in a "silent" mode by using the following syntax:
pidgin-x.y.z-offline.exe /DS=1 /SMS=0 /L=1033 /S /D=C:\Pidgin
[13:30, 24/9/2017] +55 71 8829-2655: The /L flag sets the language (Windows LCID) used by the installer, as well as Pidgin itself. The /D flag, if specified, sets the installation directory; it must be the last parameter used in the command line and must not contain any quotes, even if the path contains spaces. You may omit both the /L and /D flags and use the defaults which are 1033 (English) and %PROGRAMFILES%\Pidgin respectively. The /DS and /SMS flags can be used to enable or disable the Desktop and Start Menu Shortcuts. You'll want to use the "offline" installer to do this.