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A second company called Sofix is actually credited in the games. In the credits roll of Download they are featured under the “Thanks” heading, and in the sequel Download 2 as well as the anime adaptation they are credited alongside NEC Avenue. Sofix is a more or less forgotten Japanese developer that made a few games for the PC Engine in collaboration with NEC Avenue and Hudson. In 1992 – about two years after the first Download game – they published a digital comic adaptation of the Yawara! manga on the PC Engine, which had a look and quality very similar to the cutscenes in the two Download games. By educated guesswork, it is likely that Alfa Systems were in charge of the gameplay of Download and its sequel while Sofix handled the cutscenes, but there is very little evidence available to back this up.

The first game and the light novel were produced in parallel and released less than a month apart. The book was written by Wataru Nakajima who also worked on the story for the two games. He had previously worked on the 1989 Famicom-exclusive Seirei Gari (a Deja Vu/Shadowgate style adventure game) where he was credited for the original story. Interestingly, the credits of Seirei Gari also list Sofix and their employees, meaning that Download was not the first time Nakajima collaborated with them.