The problem doesn't have anything to do with our site, the file which was mistakenly flagged as a "trojan" by your antivirus, is just part of the Inno setup utility we use to write our installers, it's a free product used by thousands of developers, and that .DLL hasn't been updated in a while so, clearly, it's a bug of the antivirus.
A bug that can be easily explained because, what that .DLL does ( IDP means "Inno Download Plugin" ) is just downloading files and, some antivirus use flawed heuristic to detect virus they don't know about, so they try to use behavioral patterns as in: if something is downloading something else, it might be a trojan.
Of course, the whole point of a Live Update is...to download something, so the antivirus here is clearly at fault. Don't worry, we are in good company, MS own antivirus sometimes even blocks MSFS 2020...