This one might only get a small stub instead of the full image: https://apps.apple.com/us/app/macos-high-sierra/id1246284741?mt=12

Direct download of missing stuff:

File list: https://swscan.apple.com/content/catalogs/others/index-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz

• BaseSystem.dmg
• BaseSystem.chunklist
• InstallInfo.plist
• InstallESDDmg.pkg
• AppleDiagnostics.dmg
• AppleDiagnostics.chunklist

Or :

url=http://swcdn.apple.com/content/downloads/29/03/091-94326/45lbgwa82gbgt7zbgeqlaurw2t9zxl8ku7
curl -R --remote-name-all $url/{BaseSystem,AppleDiagnostics}.{dmg,chunklist} $url/Install{Info.plist,ESDDmg.pkg}