Since Cubase 5 was designed for Windows 7, you may need a few extra steps to get it running on modern systems.
After installation, you'll need to activate Cubase 5 using a valid license. Here's how: cubase 5 setup download for pc verified
Disclaimer: This guide is for educational purposes and legitimate license owners. Unauthorized distribution of copyrighted software is illegal. Always verify local laws regarding abandonware. Since Cubase 5 was designed for Windows 7,