If you want a legitimate Cubase Lite experience:
This is the tricky part. Cubase 5 was built for Windows 7 (32-bit). Modern Windows will fight you. Follow these steps exactly: cubase 5 lite free download install
Cause: Your CPU is too new (Intel 10th gen+ or AMD Ryzen 5000+). These CPUs lack legacy instruction sets. Fix: You cannot fix this. You need to run Cubase 5 Lite inside a Windows 7 Virtual Machine (using VirtualBox or VMware). If you want a legitimate Cubase Lite experience:
If you lost the installer but have a valid license number, Steinberg support might provide an FTP link to the legacy installer. This requires proof of purchase. cubase 5 lite free download install