I would guess that once again the package has been updated without changing the file name or version number. IMHO this is very bad practice on their part, but maybe I just don't know how it works in their world. If you are sure you have a clean download, you could run an MD5 checksum on the version you downloaded, and enter the new checksum in the file, which would tell the config it's ok to install. I wouldn't do this unless you are sure the file you downloaded isn't corrupt. Try downloading it on a couple different machines, and MD5 it to see if the checksum matches.
The MD5 is correct, it was an error made by me writing the line in the package conf.
I've simply put an empty space in the end of the MD5 string...
sorry