Cubase 7.5 and HALion Sonic SE Content Downloads - SOLUTION

Hello,

I am a new user for Cubase. I just purchased Steinberg UR-RT2 interface and tried to install Cubase 10.5 to record music. Unfortunately, my computer uses Windows 8, it cannot install Cubase 10.5. I found Cubase 7.5 is compatible with Windows 8 and downloaded it. However, I cannot register Cubase 7.5 in my eLicenser. I tried many times based on the instruction on this link https://helpcenter.steinberg.de/hc/en-us/articles/206086264-Cubase-AI-or-Cubase-LE-4-5-6-Registration-Fails, but is still not successful. The software on my eLicenser Control Center only shows Basic FX Suite and Cubase AI, Cubase 7.5 is not there. Thus I cannot get Activation Code to open Cube 7.5. Could you please help me to resolve this issue? Thank you very much!

Regards,
Yi