question about X1 download... where is Guitar Rig 4?

I bought X1 when it came out and tried it for a while, but wasn't really happy with it, so I've continued to use 8.5 ever since. My main PC with Sonar is now getting fixed for a while, and so I've installed 8.5 onto my laptop to use something in the meantime, but I also need Guitar Rig 4, which is in the X1 download. I'm wondering if someone can please tell me if the GR4 installation is located in the "Additional Content" or do I have to download both Producer files and install X1 just to get that? It's a several hour download, regardless, but I'd rather just download what I need, especially as my laptop has very limited space. So I'm hoping it's among the "Additional Content." I guess I'll start downloading that file for now, but please let me know if you know where that is. Thanks much.