Downloaded Electrum-3.3.4 for Mac to update my existing wallet as old version was no longer syncing with servers however now I cannot access Electrum at all, it just doesn't open. Receive the below when trying to open; i'm a bit useless so would appreciate any advice.

Traceback (most recent call last):
  File "run_electrum", line 339, in <module>
  File "electrum/daemon.py", line 337, in init_gui
  File "/Users/voegtlin/Library/Python/3.6/lib/python/site-packages/PyInstaller/loader/pyimod03_importers.py", line 627, in exec_module
  File "electrum/gui/qt/__init__.py", line 38, in <module>
ImportError: dlopen(/var/folders/pm/wxg25_sn3v7c2b874lz5y4sw0000gn/T/_MEI0RGhlX/PyQt5/QtGui.so, 2): Symbol not found: __os_log_default
  Referenced from: /var/folders/pm/wxg25_sn3v7c2b874lz5y4sw0000gn/T/_MEI0RGhlX/PyQt5/../QtCore (which was built for Mac OS X 10.11)
  Expected in: /usr/lib/libSystem.B.dylib
 in /var/folders/pm/wxg25_sn3v7c2b874lz5y4sw0000gn/T/_MEI0RGhlX/PyQt5/../QtCore
[918] Failed to execute script run_electrum
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