Having the exact same issue except I'm on Windows Server 2003 x64 SP2. First attempt, I downloaded the 4 .isos and the .cmd file to merge them. That took 4 hours. Upon mounting the .iso, it seemed fine, but failed with the error described by the OP. That took 4 hours to download from Fileconnect using the managed download utility. Shouldn't that recognize if the file is corrupt and resend?
The .iso seems to be working as it loads up fine in Daemon Tools, but the installer just fails. Even trying the shortcut to the \BEx64\setup.exe fails about .NET not installing. Seems like a poorly assembled installation package to me. I guess I'll try installing .NET manually and see if I can get further. In the meantime, I'm trying the Trialware download, but it's creeping at 100KB/sec (at most). It's going to take ANOTHER 8 hours just for that download. Oh also, I couldn't use my SymAccount to download the Trialware, I had to sign up for a new account to do so. This reflects poorly on Symantec's ability to provide it's customers with:
1) a working copy of the already paid for software
2) adequate support as to how to work around a known issue
3) sufficient high-speed download mirrors. At today's speed, 100KB/sec download is excruciatingly slow, especially for a 3.5GB file. You're a big company, get a big company-like connection and more mirrors.
4) selective product packages. Why do you need to put all languages and products in one package? Break it up so it's not such a monstrosity to download.
Frustrated.
