I've been developing for the esp8266 and Arduino successfully for some time, but now that I'm trying to use WifiSecureClient to do rest over SSL and it seems I need the latest update... so I updated the Arduino IDE to 1.6.11 and then tried to use git to update the esp8266 install to use the latest (https://github.com/esp8266/Arduino) software. When I follow the instructions I get an error saying "fatal: destination path 'esp8266' already exists and is not an empty directory." as show below.
C:\Program Files (x86)\Arduino\hardware>dir
Volume in drive C is NewBoot
Volume Serial Number is B423-22D2
Directory of C:\Program Files (x86)\Arduino\hardware
09/04/2016 06:12 PM <DIR> .
09/04/2016 06:12 PM <DIR> ..
09/03/2016 04:51 PM <DIR> arduino
09/04/2016 06:12 PM <DIR> esp8266com
08/17/2016 09:41 AM 6,349 package_index_bundled.json
08/17/2016 09:41 AM 7,194 platform.keys.rewrite.txt
08/17/2016 09:41 AM 936 platform.txt
09/03/2016 04:51 PM <DIR> tools
3 File(s) 14,479 bytes
5 Dir(s) 114,341,609,472 bytes free
C:\Program Files (x86)\Arduino\hardware>cd esp8266com
C:\Program Files (x86)\Arduino\hardware\esp8266com>git clone https://github.com/esp8266/Arduino.git esp8266
fatal: destination path 'esp8266' already exists and is not an empty directory.
Where is the 'esp8266' destination path? As you can see in the listing above, there is no such directory. I've tried uninstalling the esp8266 using Boards Manager, still no luck. Where is this esp8266 destination path and how do you update? As an alternative method I downloaded Arduino-master.zip, but I am unsure where to extract it to. Can someone tell me how you update to the latest?