drmike: Are you talking about GoG Galaxy?
If so, you probably should be posting in the development sticky since that's where the developers pay attention:
https://www.gog.com/forum/general/gog_galaxy_official_discussion_thread If not, you probably should post some specifics as to what you're talking about. Remember unless you;re one of my three ex's, we can;t read your mind.
Oldo_M: No my answer not about Galaxy.
I download non-Galaxy (Classical) updated installer and notice that in options page of new installer removed checkbox "Integrity check" (allow check installer files before installation).
In old version installer this checkbox present.
Multiparted installer cannot be verified by Digital signature (DC) because segmented structure, and DC check only .exe part.
Yes the old check is gone, been a long time since that was last available. You can use gogrepo to download and check files (I think). Probably too much effort, what with the general move to galaxy that is the only place effort goes.