As an example, they use 下在 in place of 下载. These are pronounced differently (zài in the former, zǎi in the latter). The former also sort-of means "here is" or "below are" (although nobody would actually write it that way), which means you get something that looks kind of like "below are size: 188.17 MiB" instead of "download size".

I do appreciate the author pointing out that this is just an exercise, because I would never be able to use this in practice, and I'm not even a native speaker.