Curl error installing spell files for neovim

I’m trying to install some spell files for neovim following the wiki here https://wiki.nixos.org/wiki/Vim. But I get the following error and the build fails. Can someone help me?

warning: error: unable to download 'http://ftp.vim.org/vim/runtime/spell/fr.latin1.spl': HTTP error 301 (curl error: SSL peer certificate or SSH remote key was not OK); retrying in 292 ms

ftp.vim.org has an invalid cert. So the error is correct.
Try some mirror like https://ftp.nluug.nl/vim/runtime/spell/

Thank you, that worked. Is there a list of these mirrors?

No idea, I just went to that site and saw it redirected me to another domain.