Imo, we will never be able to find a version where the trojan flag will not be trigger because i think that maybe the game was already infected by the trojan from the beginning.
But if you really want to try the game anyway with the link you've downloaded it from, you can use a Virtual Machine to play the game, that way it will be more safer for you, and it won't be able to infect your physical computer.
Only the Virtual computer will be infected if there was really a trojan.
EDIT: even after downloading the demo ver. from DLsite and running it through VirusTotal it also contain a trojan lmao ( Trojan.Malware.300983.susgen ).< but it most likely is a false positive.
I do not think its a trojan, but rather a false positive, since the exe is cracked. (I ran it in a VM and it seems ok.)
In any event, I will warn you, getting this game to run is a B-I-TCH. From what I can tell, it will NOT work properly in Windows 10, and it will NOT work properly unless the OS is installed IN Japanese from the get-go (changing the locale, system language, etc will not work, the in game text will just never show up)
I'm not sure what causes it. But I do know that in Windows 7 (installed in Japanese) it will run with no issues. (But in a VM its a bit laggy)