virus on download 3.5.6

Bit Defender is blocking download of main installer for v. 3.5.6
“has or likely to have a virus.”
Is this a known issue?

Turned off Bit Defender and downloaded. Scanned with Bit Defender. No Problem

I recently downloaded and installed 3.5.6. My AVIRA Internet Security Suite 2012l always up to date, did not show any warnings.