https://mods.factorio.com/mod/v0-18_nothing_v1-1/discussion/5fe1ecbd08b5eb622a0122be

Oh, that's kind of strange. Would you happen to know what mod this one is a dependency of that's causing the issue?

... in short, which have versions for 0.18 and for 1.1 but not for 1.0. But Factorio downloads mods if the mods doesn't have any version for Factorio 1.1 and have version(s) for Factorio 0.18 and/or 1.0.

Right, but from your post it seems to be an issue only if the mod missing a 1.0 version is to be downloaded as the dependency of another mod. I'm just wondering what mod relies on this one because it's not something you'd really build on.

I can upload a 1.0 version (hopefully the system is robust enough that a newer mod version with an older factorio version doesn't blow everything up).

EDIT: Version 0.0.7 for Factorio 1.0 is uploaded, let me know if it fixes your problem.

Yep, I can download it for Factorio 1.0 without any problem now.

(hopefully the system is robust enough that a newer mod version with an older factorio version doesn't blow everything up).

Umm, I'm not really sure, but it can be an issue...