This approach isolates the older OS from your main system. You can run your legacy PowerPC software inside the Snow Leopard VM, while your main OS (Windows 11 or macOS Sequoia) remains secure and unaffected. Creating a VM requires a full Snow Leopard installer ISO, which you can obtain by imaging a physical DVD.
Your Snow Leopard ISO cannot just be copied to a USB stick like a modern macOS installer. Snow Leopard uses an ancient bootloader. mac os x snow leopard 10.6 8 iso download
Always back up your current system before attempting to install an older OS. This approach isolates the older OS from your main system
Before looking for a download, ensure your hardware is compatible. Snow Leopard was the first Mac OS to drop support for PowerPC processors entirely. Intel Mac (PowerPC is not supported). RAM: 1GB (2GB recommended). Storage: 5GB of available disk space. Your Snow Leopard ISO cannot just be copied
Since the built-in Software Update mechanism for Snow Leopard can suffer from outdated SSL certificate errors today, manually download the Mac OS X 10.6.8 Update Combo v1.1 from an external drive or a legacy-compatible browser.