Kobo Desktop Troubleshooting
The Kobo Desktop is a computer program and, as such, problems should be approached as you would any other computer application issue. Try the following:
Resolving Kobo Desktop sign in issues
If you are continually being returned to the Kobo store home screen after you sign in, your Kobo Desktop installation may be corrupted.
To solve this problem
If none of these resolve your issues, please open a ticket with Customer Care.