Try from Germany. I'm getting the Windows and Linux versions fine from Dusseldorf, although the Mac one seems to be lost/inaccessible. Are you using the link labeled in the main/top post, under "December Update"?
i'm using the download link on itch. is there another link i don't know about?
Yes.
The itch download of Fill Me Up is supposed to be 0.3.0, which isn't compatible with Chika's Fire anyway.Check the installation instructions above - there's a hypertext link to the Weight Gaming forum where Bobo put his 0.2.0 download link.
