Kobo Glo authorization issues.

i am trying to load an Ebok from the public library on a kobo glo that I haven’t used in 3 or 4 years.  I was able to download a book from my desktop computer running windows 10, but, because we are going away I wanted to try it from my laptop which runs on windows 7.  I could get it loaded to the computer and then to the kobo.  I can read the book on the kobo from the computer, but when I try to disconnect the kobo and read it from there it tells me that I am unauthorized.  I tried with my wife’s computer ,running windows 10 , with the same result.  I have tried erasing authorization and reauthorizing to no avail.  I have also tried an older version 3.0.  Any ideas?