springinstaller is a installer for the spring engine and its games. It can be customized by attaching an http-address to an ini-file.
the installer is generated with makensis -V3 springinstaller.nsi
this outputs springinstaller.exe which can be customized by attaching an url to an ini-file:
echo SPRING:https://github.com/spring/springinstaller/raw/master/repo/springinstaller.ini>>springinstaller.exe
for a full-example what can be configured in the ini-file look at https://github.com/spring/springinstaller/blob/master/repo/springinstaller.ini