Comment Python 2 GUI crash (Score 1) 101
I have more than one mac, so I went ahead and allowed the upgrade on one of them yesterday (11/13). 12 GB is a lot to download but it actually went fast for me and I didn't experience any double-upgrades as the OP has. The upgrade did surface one problem with an old Python script I have that uses Matplotlib; as soon as the plot tried to draw, segfault was raised from some OSX screen drawing APIs. The script was using Python2 which is obsolete anyway, so I updated it to use Python3 and the issue cleared.