Starting with 2021 Release 1, OpenBridge Modeler now supports side-by-side installation. This means you could have a previous version of OBM on the same machine, and without uninstalling it, you could install the new version on the same machine. You simply chose the version you wish to run. For our users familiar with the MicroStation ecosystem, this is something new that both the Civil Products (OpenRoads/OpenRail) and the OpenBridge products are now offering. When installing the software, you are no longer prompted with an option to upgrade the previous installation, and instead the new product is installed in a new directory ( by default - C:\Program Files\Bentley\OpenBridge Modeler CE 10.10).
The benefits of side-by-side installation include the ability to have multiple versions of the software on the same machine, either for the purpose of testing the new releases or for being able to work on different projects using different versions of the software (perhaps compliance with project mandates). However please note that design files once opened in new versions of the software cannot be opened with older versions of the software. A warning is shown and a back-up file is created when opening older version files in the newer release. However please note that at this time OpenBridge Modeler does not support downgrading of files (unlike the OpenRoads products).