Once upon a time, I would have used Wine to unpack those installers in Linux. But these days, the "innoextract" command line tool seems to be doing a good job too. Even if that'll get you a bunch of files that I assume are only used during the installation, as well as the installed files themselves. I think the official web page for it is https://constexpr.org/innoextract/
Since the file format is apparently well understood, I guess there's no technical reason that DREAMM couldn't install the games directly from those installer files. But I haven't heard anyone say it does, and I've never tried it.