muntdefems: WARNING! Some of these new installers may be incompatible with the innoextract utility and hence with user-created tools that rely on it like adamhm's Wine wrappers, or the ./play.it project. At least one game (Freedom Force) has been confirmed to break compatibility with innoextract, but others may be affected too. Consider keeping the old installers in case you download the new ones.
Right now, only the latest installer for Arcanum broke compatibility with ./play.it.
The previous installer (setup_arcanum_184.108.40.206.exe) is still supported, if you do not have it and wish to use the ./play.it script for Arcanum I advise asking a download link to GOG support.
From what I’ve seen, only some Windows installers are impacted, so there is hope this has been a mistake on GOG packaging team side and will be fixed at some point.
If in doubt, and you’re going to buy a game to use it through ./play.it or Adamhm’s wrappers, ask in the project thread and we will tell you if the latest installer for your game is supported.