After I've navigated through the forum, I got the same errors as you people, when trying to download through the pkg in my pc.
You follow exactly the guide in ps3news, but the second game (that is at 32kb/0%) HAS TO BE LARGER IN SIZE THAN YOUR PKG.
For example: I was always trying with downloading Iron Man demo (990MB) from PSN to install MGS4 demo (1.3GB). It always gave me errors.
Then, I tried with another pkg, lower in size (550MB). IT WORKED.
Sorry if this is already known but I couldn't find it.