Updating Anti-virus Definitions

[pete.xayavong]

I download the avvdat files from

ftp://ftp.mcafee.com/pub/datfiles/english/

They come as .tar files.  I noticed some of the documention references the file being encrypted (filename.tar.enc)

and then uploaded to the firewall.

Do I have to encrypt the tar file before the firewall can read it ? 

Or is the ftp download site not correct and I should be looking for .tar.enc file?

Thanks,