Description of problem:
Crash at launch.

The program self-updated when I opened it the last time, earlier today.

Version-Release number of selected component:
torbrowser-launcher-0.2.8-1.fc27

Additional info:
reporter:       libreport-2.9.3
cmdline:        /usr/bin/python2 /bin/torbrowser-launcher
crash_function: check_min_version
exception_type: IOError
executable:     /bin/torbrowser-launcher
kernel:         4.14.14-300.fc27.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
launcher.py:603:check_min_version:IOError: [Errno 2] No such file or directory: '/home/david/.local/share/torbrowser/tbb/x86_64/tor-browser_en-US/Browser/TorBrowser/Docs/sources/versions'

Traceback (most recent call last):
  File "/bin/torbrowser-launcher", line 30, in <module>
    torbrowser_launcher.main()
  File "/usr/lib/python2.7/site-packages/torbrowser_launcher/__init__.py", line 62, in main
    app = Launcher(common, url_list)
  File "/usr/lib/python2.7/site-packages/torbrowser_launcher/launcher.py", line 91, in __init__
    if not self.common.settings['installed'] or not self.check_min_version():
  File "/usr/lib/python2.7/site-packages/torbrowser_launcher/launcher.py", line 603, in check_min_version
    for line in open(self.common.paths['tbb']['versions']).readlines():
IOError: [Errno 2] No such file or directory: '/home/david/.local/share/torbrowser/tbb/x86_64/tor-browser_en-US/Browser/TorBrowser/Docs/sources/versions'

Local variables in innermost frame:
installed_version: None
self: <torbrowser_launcher.launcher.Launcher instance at 0x7f5555ad18c0>