Use the .deb packages such as modelio-open-source5.1_5.1.0_ubuntu_amd64.deb . Note that Ubuntu 20/22 users may need to manually install the libwebkitgtk-3.0-0 library first.
Download the Modelio Open Source 5.1.0 - 64.exe installer. download modelio 5.1
Modelio 5.1 is available for Mac, but requires JDK 8 to function correctly; newer JDK versions are not compatible. Use the