It downloaded 90% normally (600kb/s) and now it is stuck at 1/kb/sec
Try to restart the launcher, it should save the progress and ho on where it stopped.
I restarted several times and it is stuck at 144 Kb to go, left it for an hour, came back and restarted launcher, left it for another hour, it is still stuck at 144 Kb left
Can you try to click the play button?
If this stops or crases close it out should run fie. Mine crashes from time to time so I leave it a few min then x out of it restart and works.