Fit4NM 3.8.6 was released on Sep 22, 2014.

You can download it here (

In this version, we fixed two major bugs as below.

1) When configured to NONMEM 7.3 only, fit4NM requested that paths for NONMEM 6 be designated.

2) When estimating likelihood (no sigma in a control file), condition number was not calculated. 

And, we added two functions to view and edit control and/or data files. In configuration, you can indicate the paths for external editor such as notepad, and spreadsheet program such as MS excel or OpenOffice Calc.