Ok I have a Sony not a Kobo and I can download the acsm link and load it through my Sony reader software no probs, but I also used to have the Kobo PC app it would sync with the store list all my kobo books with their covers and I could open them to read the books on my pc if I wanted to.
But then the software stopped working so I went to
http://www.kobobooks.com/ereadingapp and downloaded the Desktop app which states it's for reading on you laptop or PC however it leads you to the same file linked by JD Gumy above and when you install it, it insists you connect you kobo during the install and won't let you continue untill you do?
Confused here does the kobo store no longer have a standalone desktop app