If you have lost your original DVD, Steinberg provides full ISO installers for some older products upon request or through their archived FTP server. Compatibility Warnings
Cubase 5 was designed for older hardware and software architectures. Running it on modern Macs (especially those with Apple Silicon or versions of macOS beyond High Sierra ) may lead to stability issues. Steinberg Forums Cubase 5 | Steinberg cubase 5 download mac os verified
By following this verified guide, you should be able to successfully download and install Cubase 5 on your Mac OS. Happy producing! If you have lost your original DVD, Steinberg