Trying to download spellchecking file and getting error "Sorry, download failed"

Hi,
I have downloaded Vim 8.0.0027 from github https://github.com/vim/vim-win32-installer/releases and installed it on Windows 7. Everything works fine.

But now I would like to download Slovenian spellchecker, but I am getting an error (see attachment). Most probably this is a problem of our enterprise firewall system restricting several types of downloads.

Can I download this spellcheck file from some https secure web page or similar, in order to be sure firewall does not restricts the download?
Thanks

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