Pendragon had posted a message concerning blocked downloads with ZAISS 13.1.211.000 and his thread was closed so I could not respond with a solution. I also experienced blocked downloads after upgrading to version 13.X.X of Security Suite running Vista 32bit. No downloads in FireFox 31 or IE. Pendragon also experience no downloads in Chrome as well on Windows 7 Pro 64bit. I tried several configuration changes and finally found out what was blocking the downloads:
Go to AntiVirus & Firewall / AntiVirus Anti-Spyware / Settings / Advanced Settings / Premium Protections. Uncheck "Enable Web Monitoring". Click OK and close/re-open browser. Downloads should work now. I don't know how important this Web Monitoring feature is, but it is causes an issue for me in versions 13.x.x. with Firefox and IE. Unchecking Web Monitoring instantly restores the ability to download.