Version mismatch error is caused when project files become out of synch. This happens when a project is exported and imported on another PC. The export process does a code optimization thus resetting time and date stamp information in the .dsk file. This was an issue in Concept versions prior to 2.5. A workaround was to copy the complete project file from the source PC to the target PC. Concept 2.5 resolved the issue by adding an option to the Converter export process,
Export >> Project with used DFBs ( Re-Connect to Equal ).