Yes, according to some posts in other forums, KB947821 should be also in runonce. Qoute: And I noticed when I integrate this update with other tool, my installation file size grew by 525MB, which not happened with NTLite and that's when I started to suspect that something is wrong. Also, it seems that KB947821 is only meant when there are problems with WU, so maybe you should hard code it and give some warning that it'll be integrated as RunOnce and even that this update is not required. And, I have one more update, which you maybe can help me with. KB2830477. I integrated it, but Windows Update still shows it, but only 900kb, and original size of update is around 6MB.