I've installed ADE and it shows KOBO on the left side above bookshelves, so I think it's installed okay and recognising my e-reader. In My Library on KOBO i have a number of free books saved that I need to use ADE to open. I've clicked on download, save and open. ADE opens and an error message appears saying Unable to open - errors were encountered. I have checked that my default programme is set to open .pdf in ADE. What am I doing wrong?
If the books are free you don't need ADE to copy or read them.
To copy them, use a file manager (Windows Explorer, Finder, ...)
If they are .pdf files, read them with standard Adobe Reader.
If the are .epub files, read them with the free Calibre program. http://calibre-ebook.com/ (much better than ADE except it won't read DRM books)