It is impossible that the installer is causing this, otherwise we would have complaints of this happening every single day from new customers. The only reason an install would be interrupted, that I can think of, is something blocking the download. We do know that many anti viruses block Gizmo (false positive). This has happened to me.
In your case, I honestly can not think of what is causing this. Even Cameron is puzzled.
If you want to wait for the update, you're more than welcome.
Here is an invite to our discord server, so maybe you can ask Saso (username totoritko) for any help regarding this. I've already shown him this thread, and he's also puzzled, but perhaps you can go through a few steps with him.
https://discord.gg/m3qRsz