TNetEncoding.Base64String does not exist in D10.4

[raketenwurm69]

Units "intf.ZUGFeRDInvoiceDescriptor20Reader" and "intf.ZUGFeRDInvoiceDescriptor23CIIReader"

function TZUGFeRDInvoiceDescriptor20Reader._getAdditionalReferencedDocument( a_oXmlNode: IXmlDomNode): TZUGFeRDAdditionalReferencedDocument;
begin
...
    var strBase64BinaryDataBytes : TBytes := TNetEncoding.Base64String.DecodeStringToBytes(strBase64BinaryData);
...
end;

Changing "TNetEncoding.Base64String" to "TNetEncoding.Base64" however works fine.