The fxp can be downloaded from:
SPECS
My computer:
Version: 0.96 beta (build 1027)
Architecture: 32 bit
OS: Linux
Language: English
Country: US
CPU: AMD V120 Processor
CPU Cores: 1
Their computer:
Version: 0.96 Beta (build 1027)
Architecture: 64 bit
Operating System: Mac Snow Loepard
Language: English
Country: Canada
CPU Name: Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
CPU Cores: 4
Perhaps because mine is a 32-bit and their a 64-bit version?