I did it correctly both times, using “install to USB”. I actually tried several times. So I’m quite certain there was something wrong with the first USB stick I used, as I had no such problem with the other one I used. I was quite puzzled to read all the hypothesises people came up with as to what I “could” have done. It’s pretty straight forward. Following the instructions on the site for how to install is what I did from the beginning, and it’s not rocket science. I’ve been using this software since it was called raspbmc from when the first raspberry pi came out. I know how to install the software.