Any project file saved in an earlier version of Designer 2 can be loaded by a later version.
Project files are compatible between the PC and Mac versions of the software.
Project files created in Designer v1.x.x are incompatible with Designer 2, but can be converted using the Project Migration Tool (available to download from our Designer 2 downloads page).
A project file saved in a later version of Designer may not be backwards compatible with earlier versions of the software. If in doubt, please contact support.