Visual MODFLOW Flex is backwards compatible with projects made in earlier versions. However, Visual MODFLOW Flex is not forwards compatible, which means you cannot open a project that was made in a newer version of the software than you are running. This generally means that if you are working on modeling projects in a team environment, it is recommended that all members of the team work using the same version of Visual MODFLOW Flex.
Creating a full backup is strongly recommended before opening projects made in older versions of Flex, since Visual MODFLOW may update certain files during common operations without an explicit save. Please use caution when opening projects made in older versions of Flex without such a backup. In order to copy files from one location to another, please see the section on the File Structure of Visual MODFLOW Flex.