Problems Installing DRAMAtical Murder Re:Connect

I'm trying to follow the guides but keep running into an error message. (This is the first time I've tried installing a game like this, and a lot of the tech vocab is a foreign language to me; sorry in advance for my lack of knowledge).

I did the Japan location thing, downloaded the parts from Mega, unzipped them in the same folder to get the ISO file, and downloaded Daemon Tools Lite, then mounted the file. But I get this message when I try to run it: https://imgur.com/a/MeQOeUC

This is what the file details look like in the folder, so everything seems normal: https://imgur.com/a/suDeLhj

I went into the program itself and ran the set-up function there (I got an error message doing that as well, although I don't know if it's affected anything: https://imgur.com/a/Z1Dat8n) But it's asking for the log-in code so I guess that's the "official" installer that we're supposed to bypass?

I've deleted the ISO, re-downloaded and unzipped the files several times, but get the same error. Can anyone save me from my lack of computer skills?:pushup:My gratitude will be eternal.