A new version of SI has been released! (13 October 2018)

The changelog is at http://scienceandindustrygame.com/post/14b13/

Installer download: http://scienceandindustrygame.com/setup.exe
(Or get the zip at http://scienceandindustrygame.com/si_14_b13.zip)

This is a self-extracting 7zip. You should point it to your Half-Life/ folder (and it will make an si/ folder).

Back up your si/ folder before you install this. You can recover your old settings from si/config.cfg