sh.exe C:\Users\username\AppData\Local\Atlassian\SourceTree\gitflow_local\gitflow\git-flow init -d
flags:WARN -d --
C:\Program Files (x86)\Atlassian\SourceTree\tools\getopt.exe: invalid option --
flags:FATAL unable to parse provided options with getopt.
I contacted github account, and want to "Git Flow" and it shows a message like above.
There was a similar issue reported at Atlassian:
You can see more about git-flow installation within a SourceTree context in this issue: