Are you doing this in cPanel's File Manager?
Unfortunately this host's File Manager won't allow me to extract, I have to use something called Archive Gateway. So I'm using a combination of File Manager and Archive Gateway to try to do it. My usual host uses cPanel and it is so much easier to work with.
Ouch. I suppose changing hosts is not an option?
unfortunately not, it's my client's choice.
Assuming that the file is there, it looks like a permissions or ownership problem with that file, its directory or a directory above it. The fact that the assets and assets/components directories were not created also suggest a permission problem there.
Ok, so how do I go about fixing that? Sorry this is all new for me.
From what I'm seeing in the FileManager header.tpl permissions is 644 (does that make sense?) and all the directories above it are 755.
For files and directories, 644/755 is usually correct. It could be a problem with the ownership of the directories.
I would tell your host about MODX having trouble creating those directories and give them the full path to that header.tpl file. They should be able to figure out what's happening.