To make an actual installer from the source code, you need to compile and run the Haskell program, which will generate an NSIS script that must in turn be compiled. I used the unicode NSIS compiler available at http://www.scratchpaper.com/. If using a non-unicode version, be sure to use a "long strings" build to avoid corrupting the user's %PATH%. The .nsi script expects stack.exe to be in the same directory.

make-installers.bat <STACK-BUILD-DIRECTORY> <STACK-VERSION> will do all the above.

To upload to the latest Github release, set GITHUB_AUTH_TOKEN and run upload-installers.bat <STACK-BUILD-DIRECTORY> <STACK-VERSION>.