andreasaspenberg2: sure, that would be optimal. the issue is that they would need more staff to look through the installers. the cheapest solution is that users report the issues. that is why i created this topic.
Actually, the cheapest solution would be to run an automaton from various locations that polled the file downloads (for most categories of file errors, you don't even need to download the actual file if you want to save on bandwidth... you'll notice it right away just fetching the file's xml metadata or doing a head request on the download link) from various regions at certain intervals and reported bad downloads to the gog staff so that they can act on it, hopefully before even receiving a single support ticket.
That would disrupt their users far less and also their support agents who still need to reply to the support tickets the bad download links have created even after the issue has been resolved.
But as is often the case when it comes to technical decisions around the gog platform, the flagellatious way has been historically preferred here.