Do not install Cubase first. Run the v6.11.10 (the last version that supports the blue dongle). Reboot.
As he launched Cubase 5 for the first time, he was greeted by the familiar interface, but with some exciting new features and improvements. He was particularly impressed by the new VST instruments and effects, which looked and sounded amazing. Cubase 5 Download 64 Bit
References
Only download from Steinberg’s official legacy portal. Remember: No YouTube link, no torrent, and no "keygen" is worth destroying your system. Do not install Cubase first