I'm getting an error message that some file is missing and that the mod has to be deactivated for that reason.

Could you paste the error so I can check?
I am not getting any errors

https://i.imgur.com/iCcRsdK.png

This has been fixed now. Please redownload :)

Still getting an error on v1.4.9, which I just downloaded, but the file it can't load is *green-patch.png, not the mask .png

Could you try re-installing the mod? It's working for me

I deleted the .zip file from the library, then redownloaded it, same issue. I'm on MacOS. Is there anything else needed for a reinstall?

Also found the trashcan icon from the manage tab in Mods, reinstalled from there, still the same issue.

I dug into the .zip file in the Mac Library.
The file not found is hr-boiling-green-patch.png, and in fact that file is not in the chemical-plant folder.
It does contain hr-boiling-green-patch-mask.png and hr-boiling-window-green-patch.png but not the one that's being asked for.

I can't even see the mod in my mod list anymore. I can download it but it does not appear in the mod list. I deleted the ZIP file, redownloaded it, nothing. I checked the contents and what I can see is that the root folder in the ZIP file is not named the same as the ZIP file itself. The version number is missing. Still, even if I change the folder name accordingly, I cannot see the mod in the list.

Fixed it manually. duplicated the green-patch-mask.png with a copy named green-patch.png and it works now.

Interesting.

I'll look into this.

It has been fixed!

Evidently there were some duplicate files in the mod that had to be removed.

It works again! Thank you very much! Keep rocking!

Fantastic!