I was using the appcelerator and it asked me to upgrade, after this, the program was not responding, I closed it while the program was installing an update and when I tried to launch again, the program returned an error: "Appcelerator CLI is currently installing or upgrading" [...]
Now I can't open the appcelerator.. and there aren't any process running for I can close and stop the "download"(if there is some download in process).
I don't know if there is some download in process and neither your progress...
I found a way to resolve. Just delete ~/.appcelerator /.installing file