Search for the Titanic is an MS-DOS game. Any reason why it's released as Windows-only? Is there anything preventing it from being run on other OSes via DOSbox?

You can generally unpack the Windows installers with innoextract to get the files. If you do that, check the .conf files included to see how the installer would set Dosbox up.

Innoextract works both on macOS and Linux.

I prefer this method anyway, because I have Dosbox all setup nyself and I like to keep my Dos games organized into one specific location.