Board Thread:Suggestions/@comment-123.2.253.107-20190728032624/@comment-5815431-20190728040804

They're not updating 1.7.10 any more, that version is over 5 years old and they just spent over two years getting out of that version.

Downloads for the mod are here: https://www.curseforge.com/minecraft/mc-mods/fossils/files

The recommended llibrary for the latest 1.7.10 version is 1.5.1, not sure why you're looking for 1.4.0: https://www.curseforge.com/minecraft/mc-mods/llibrary/files/2319767