If you’re acquiring a GOG release somewhere, it should be the regular, normal installer because GOG releases don’t have DRM that needs cracking. Someone just needs to first get it legally from GOG and then share it somewhere. If you scan it with antivirus and it finds something, get rid of it and try another source.
Otherwise without torrenting, you’d have to find a place with direct downloads.
edit: though you may want to wait longer for them to patch more bugs etc, because if you don’t have a source to download the GOG updates only, downloading 100+ GB each time is a pain.