The last LE version (1.0.8) of the XILS 3 LE  can be download with the following links :

PC - XP, Vista,  and Windows 7, (32 bit and 64 bits)

xils3_limited_win_setup_V108.exe

OSX 10.4.0 (32 bits), 10.6.0 (64 bits) and  later

xils3_limited_osx_setup_V108.dmg

Download the XILS 3 user manual here

Install tips on windows 7 and vista :

After accepting the license, you may have to browse to select a correct user accessible folder.

the default folder is :  c:/Users/Public/Documents/XILS-lab/XILS 3

The XILS 3 LE version is compatible with Muse Research Receptor 2 !

Download the manual for installing the XILS 3 LE on your Receptor

(Thanks to Paul Barret)