To run Mac OS 9.0.4, your machine—or virtual machine—must meet specific requirements:
While it's not as easy to find the Mac OS 9.0.4 ISO as it once was, there are still several resources available: mac os 9.0 4 iso
When searching for a Mac OS 9.0.4 ISO, look for trusted archival platforms: To run Mac OS 9
Related search suggestions for further research: To run Mac OS 9.0.4