Note that python-stem appears in Debian wheezy and newer (so by extension Tails 1.1 and newer), and it appears in Ubuntu 13.10 and newer. Older versions of Debian and Ubuntu aren't supported.
Install the [latest python 2.x](https://www.python.org/downloads/) from python.org. If you use the built-in version of python that comes with OS X, your .app might not run on other people's computers.
To install the right dependencies, you need homebrew and pip installed on your Mac. Follow instructions at http://brew.sh/ to install homebrew, and run `sudo easy_install pip` to install pip.
These instructions assume you're running Windows 10. They should work for other versions of Windows too, except for perhaps installing the Windows SDK which is required if you want to sign binaries with Authenticode.
* Go to Start and type "advanced system settings", and open "View advanced system settings" in the Control Panel. Click Environment Variables. Under "System variables" double-click on Path, and add `C:\Python27` and `C:\Python27\Scripts`. Now you can just type `python` to run python scripts in the command prompt.
* Go to http://www.riverbankcomputing.com/software/pyqt/download and download the latest PyQt4 for Windows for python 2.7, 32-bit (I downloaded `PyQt4-4.11-gpl-Py2.7-Qt4.8.6-x32.exe`), then install it.
* Go to http://sourceforge.net/projects/pywin32/ and download and install the latest 32-bit pywin32 binary for python 2.7. I downloaded `pywin32-219.win32-py2.7.exe`.
* Go to Start and type "advanced system settings", and open "View advanced system settings" in the Control Panel. Click Environment Variables. Under "System variables" double-click on Path, and add `C:\Program Files (x86)\NSIS` to the end. Now you can just type `makensis [script]` to build an installer.
* Go to https://dev.windows.com/en-us/downloads/windows-10-sdk and install the standalone Windows 10 SDK. Note that you may not need this if you already have Visual Studio.
* Go to Start and type "advanced system settings", and open "View advanced system settings" in the Control Panel. Click Environment Variables. Under "System variables" double-click on Path, and add `C:\Program Files (x86)\Windows Kits\10\bin\x86`.
* You'll also, of course, need a code signing certificate. I roughly followed [this guide](http://blog.assarbad.net/20110513/startssl-code-signing-certificate/) to make one using my StartSSL account.
* Once you get a code signing key and certificate and covert it to a pfx file, import it into your certificate store.
* Open a command prompt, cd into the onionshare directory, and type: `pyinstaller -y install\onionshare-win.spec`. Inside the `dist` folder there will be a folder called `onionshare` with `onionshare.exe` in it.
Note that you must have a codesigning certificate installed in order to use the `install\build_exe.bat` script, because it codesigns `onionshare.exe`, `uninstall.exe`, and `OnionShare_Setup.exe`.
This will prompt you to codesign three binaries and execute one unsigned binary. When you're done clicking through everything you will have `dist\OnionShare_Setup.exe`.