If it's a book bought from Kobo, unless you have opted to download it in ePub format, it is in the Kobo format, and has to synced via the Kobo Desktop program.
You can find the Kobo desktop program under the Start button in the the Kobo folder.
Once you have launched it, you do an "Update Library" in the desktop program to bring new books down to your PC, and then, with the Kobo reader attached to your PC you should be able to do a "Sync" in the desktop program to update the Kobo itself.
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