Sometimes __tmp_package.zip cannot be deleted

[kblomqvist]

Traceback (most recent call last):
  File "X/threading.py", line 639, in _bootstrap_inner
  File "fetch.downloader in C:\Users\Kim\AppData\Roaming\Sublime Text 3\Installed Packages\Nettuts+ Fetch.sublime-package", line 46, in run
  File "fetch.downloader in C:\Users\Kim\AppData\Roaming\Sublime Text 3\Installed Packages\Nettuts+ Fetch.sublime-package", line 199, in download_package
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\Kim\\Documents\\Workspace\\foobar\\__tmp_package.zip'