You can, but not in the Ubuntu/Debian packages shipped by us. You can unzip all files into a single directory and call /path/to/openmodelica32/usr/bin/omc. But you need the 386 dependencies for that and Ubuntu doesn't allow lapack, sundials, etc non-native packages. So you need to provide them as well. Annoying

I usually use debootstrap / schroot to install a 32-bit Ubuntu on top of 64-bit Ubuntu when I want to play with the 32-bit OS. It's more light-weight than a virtual machine; essentially it is a second Ubuntu installation in some directory of your filesystem. So it's convenient; you can use the pre-built binaries and use the same home directory as your regular Linux installation.

OK, thanks. I think I will just use another Virtual Box image or Windows.

Finally I did use Windows to look into some problem with the 32bit version and Annex60:
https://github.com/iea-annex60/modelica … issues/668
OpenModelica seems to be treating some Reals as Integers, is that a bug or is that a feature?
For some numbers it did not matter, but some Integers get truncated in the 32bit version.