Installation on 32-Bit computer fails with the x86_64-linux-gnu problem.
Do you have a more precise error message?
If it can help, the doc of py3exiv2 says that it needs python-all-dev (≥ 3.2), libexiv2-dev (≥ 0.20), libboost-python-dev (≥ 1.48), g++ to build [I guess it is the name of the debian packages]
Have installed 3 times STMANI3 on Linux Mint 19.3 Mate 64-Bit computers successfully! Installation on 32-Bit computer fails with the x86_64-linux-gnu problem.
Installation on Ubuntu Studio 20 is starting the STMANI-GUI. It is complaining about missing restore-trash