"apm install ide-flow" Fails On Windows 7

[Joncom]

Perhaps I'm the first one to try using this package with Windows, since support is new?

Installation fails fast.

$ apm install ide-flow
Installing ide-flow to C:\Users\Jonathan\.atom\packages failed

npm ERR! git submodule -q update --init --recursive: C:\Program Files (x86)\Git\mingw32/libexec/git-core\git-submodule: line 18: .: git-sh-setup: file not found

npm ERR! git submodule -q update --init --recursive:
npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\\Users\\Jonathan\\AppData\\Local\\atom\\app-1.10.2\\resources\\app\\apm\\bin\\node.exe" "C:\\Users\\Jonathan\\AppData\\Local\\atom\\app-1.10.2\\resources\\app\\apm\\node_modules\\npm\\bin\\npm-cli.js" "--globalconfig" "C:\\Users\\Jonathan\\.atom\\.apm\\.apmrc" "--userconfig" "C:\\Users\\Jonathan\\.atom\\.apmrc" "install" "C:\\Users\\Jonathan\\AppData\\Local\\Temp\\d-116821-3060-y1fx3e\\package.tgz" "--runtime=electron" "--target=0.37.8" "--arch=ia32" "--global-style" "--msvs_version=2013"
npm ERR! node v4.4.5
npm ERR! npm  v3.10.5
npm ERR! code 1

npm ERR! Command failed: git -c core.longpaths=true submodule -q update --init --recursive
npm ERR! C:\Program Files (x86)\Git\mingw32/libexec/git-core\git-submodule: line 18: .: git-sh-setup: file not found
npm ERR!
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!     <https://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     C:\Users\Jonathan\AppData\Local\Temp\apm-install-dir-116821-3060-kz663c\npm-debug.log

It seems that "git-sh-setup" is not found. But what's strange is that Git seems to be working normally. And indeed the "missing" file does exist:

$ find / -name "git-sh-setup"
/libexec/git-core/git-sh-setup
/mingw32/libexec/git-core/git-sh-setup

PS:

$ apm --version
apm  1.12.5
npm  3.10.5
node 4.4.5
python 2.7.6
git 2.6.3.windows.1
visual studio 2013

$ flow version
Flow, a static type checker for JavaScript, version 0.32.0