First off I’m having a lot of trouble using the internet. I have a thread about that. I haven’t fixed it. It’s possible the problem is in my MacPro. I don’t know. But THIS is about installing HS on a new SSD PCIe drive. I’m making this my primary boot drive. I booted into a SSD with High Sierra. The Install MacOS HS app is on the target SSD. I click on the install, it opens. I select the proper drive. Warns me it has to restart and may have to reinstall a few times. Mac restarts. It boots up to the same old SSD. I put my password in. The only thing that’s in the target SSD is the HS install app and a folder MaCOS Install Data. No instructions. I can repeat these moves ad infinitum. Any clues? The first problem I’m aware of is I can’t seem to download. I just can’t do it. It doesn’t download. So perhaps if the install requires downloading data from Apple I’m stuck. Also - perhaps an unrelated thing - half the time I launch into this test SSD HS drive, the one I’m using to try and install HS on the virgin SSD - I get a VERY bright screen. I just have to reboot and mostly it comes back normal. My regular boot drive is a Sierra HD, but I’m trying to ditch that.