An update was released for the launcher. You can update the launcher by clicking "Update launcher" at the bottom right (you may need to check for updates). The launcher will now try harder to not re-downloaded existing files, even if version information was lost or the files were imported from elsewhere. In addition, there was an update to the modpack: Some music files were updated for the spawn. Fixed an issue with crafting recipes, but this will not take effect until the server is restarted.