If I host my games on my own site browsers like Chrome will scream "this is a file that isn't regularly downloaded ARE YOU SURE??"
This should only happen if the file hasn't been downloaded much and is either unsigned, or signed with a new codesigning certificate (the more your file is downloaded, the more reputation it gets; if the file is unsigned, the file itself is collecting reputation; if it's signed, the reputation applies to the certificate instead, so all downloads signed with the same certificate will count).
Unfortunately, the price of codesigning certificates seems to have trippled in the last few years – $188 for a 3-year certificate in '21, €485 two months ago…