I was having the same problem as David_Lame, but installing the DFU drivers separately fixed it. They failed to install initially when I installed the spark max client. Thank you for posting them!!
As a heads up on another issue, earlier on in my troubleshooting I tried checking for updates on the help tab in the client. This installed an updated client, 2.0.1, where the “scan bus” button was missing! reinstalling the client and leaving it at 2.0.0 fixed the problem.