Does that mean STMANI3 is working only on 64-Bit Linux Systems?
The reference to the architecture x86_64 is in the "Possible Installation Issues" section.
This comes from the installation/compilation of the dependency "py3exiv2" which is problematic for some systems because of the path of the boost library.
The program itself is written in python3 and depends on numpy, opencv-python, Pillow and py3exiv2, plus some programs called directly ("exiftool" is the one coming in mind).
As long as your architecture accepts those programs, STMANI3 will probably work.