I have a similar problem: I don't have eReader and only want to read on my laptop or Kindle. I bought a book from Kobo, downloaded the file in acsm format to my laptop, and tried to use ADE to convert it to ePub and copy it to my Kindle, following the instruction from the Kobo website.
However the ADE screen requires you to specify the book vendor from a given list, and Kobo is not in it!!! The result is that I can't download the book, and can only read it on this particular laptop - using either the Kobo application or ADE - but can't take it on the road!
I feel rather upset by the whole thing, since Kobo should have tested and checked their instruction more carefully. More importantly, I can't read the books outside of the office.
Any help would be greatly appreciated!