[RASMB] MacNonlin for OS X (or anything close)?

[Reba Howard]

Dear RASMB,

Is there a relatively current version of MacNonlin out there?  All I've 
been able to find is the OS7-era version, the link to which doesn't 
even appear to be active.  I've been processing XL-A sedimentation 
equilibrium data on a series of related constructs for about a year 
now, mostly by hand (loving the Excel Macros)--but that's only going to 
go so far when it comes to trying to fit multiple self-associations.  
Unix would even be fine--anything besides the Windows version?

Reba Howard