Does anyone still have access to the Big Box files, or the key needed for the download link on Mega? I'd post a link to it, but I have a feeling it will cause my whole question to get removed.

Nevermind. I was able to get it from their homepage, but using the German new article for the Big Box version. Something may have gone wrong with the English version of that news post and the specific link. Well, I'll keep this here for anyone else to find that has this same issue.

Big Box Direct Link: Rott Big Box