Disappears

When it works, it's sublime. But as soon as I minimize it, it literally disappears from the hard drive. So I uninstall and try to download anew. But then it won't install--I get the Abort/Retry/Ignore message and that's that. If I wait a few days I can download and install it again, but then this cycle repeats. How come?

It sounds like the client is still running, check the hidden part of your tray. You can always disable minimizing to the tray by unchecking Options->General->Minimize to Tray.