Articles 59
In addition to the procedures described in Q/A section, you need to put a file, called "NM.version" to run number subdirectory in order to explore NONMEM results in fit4NM 3.3.8.
You can open and edit this file in editor program.
For NONMEM 7
"x"
"1" "NM7"
For NONMEM 6
"x"
"1" "NM6"
If you used NONMEM 6, you don't have to follow this process, because fit4NM is working well with NONMEM 6.