What does the error code 504010038 mean?

The error appears when trying to install software with Web-install. The whole message is something like (translating this from finnish):

Source file is not found. This would be the link to the file Make sure that the file exists and you can use it. Network communication error: 504010038

The error number seems to differ from message that I get when I am not connected to the internet, which gives the same error messages exept the code is 502010093.