I have ran one game and my disk is containing some space in KBs. The installation of module download keep stucking and sometimes even screen is flickering.
The handling is better in this case, now -- you at least get the proper message about low disk space -- but there are still some UI issues that need to be resolved:
1) The progress dialog spawns on top of the error dialog
2) Clicking cancel doesn't actual cancel the operation
Fixed a lot of underlying error handling issues, this should be working properly now.