Download the x86 package if you want to run FusionAnalyser under a 32bit Operative System (OS)
Download the x64 package if you want to run FusionAnalyser under a 64bit Operative System (OS)
If you’re not sure about which OS version (32 vs. 64bit) you’re running:
Under Windows 7 or Vista: Control Panel -> System and Maintenance -> System
Under Windows XP: Control Panel -> System. In the ‘General’ tab, ‘System’ section, if no ‘x64’ tag is reported in the OS name (e.g. Microsoft Windows XP Professional Version xxx), then the system is a 32bit.