Transnomino will be built for a specific minimum supported macOS version. Sometimes a version is selected to be able to use a specific macOS feature. In other cases, Transnomino will at least follow the latest minimum supported macOS version recommended by Apple which currently is macOS 10.14.6.
It is recommended to install the latest version of Transnomino as it will contain the latest features and bug fixes. However, if for some reason the latest version cannot be installed you can try to pick one of the versions below.