Please consider moving Linux Kodachi to other hosting provider (for example: GitHub, GitLab, etc.).
It seem that for some reason, SourceForge is corrupting the downloads (usually the checksum doesn't match) due the multiple redirects and additional pages
I don't think this is valid
In all three attempt's to download it, the checksum varried from the one saved in the checksum file, so something is not ok with the download system
Which checksum file are you checking ? You also have 2 version so 2 Checksums
Not from SF for sure or else others will complain its only you.