For the virus threat, the way DLSite packages their English translation is by using something called Enigma Packer to pack all the English translated files into the "game_en.exe" file, so that the original "game.exe" runs the original game version, but the English executable (game_en.exe) runtime patches these files as they're loaded. UNFORTUNATELY, Enigma Packer is also used by a lot of malware.
I'm 99% convinced this is just another false positive (especially since the malware signature changes after you unpack the game), but I've included a way to make it 100% certainly safe. I've extracted the English-translated files out of the executable, so there's no longer a need to use it. Here's how to go about it:
- Download the original file. If antivirus complains, overrule it. Trojans can't hurt you from inside a zip file.
- Unpack the file. If antivirus complains again, ACCEPT it. It'll just delete the "game_en.exe" file. This is fine, we don't need it.
- Unpack my patch (it's the attachment to this post) over the folder. Overwrite the conflicts you get.
- If you still have "game_en.exe", delete it.
- Launch the game with "game.exe"
What this essentially does is hard-patch the game with the English translation. Enjoy!