On the download page you will find the executable for each SVN commit in the HeidiSQL repository. The executables are processed in conjunction with a SVN post commit hook. I just extended this process so it also creates the installer with that executable, using a InnoSetup command line. This way, users who need a full installer and also want to use the latest build can do that in one download.
Thanks to Jordan Russell for that excellent, free InnoSetup.