1.) Turn of your Norton Anti-Virus Internet Security, it is known to sometimes block the download box from popping up from your screen.
2.) Turn off your Download Accelator(shouldn't use this anyway).
3.) ** Turn off any anti-virus/Firewall or add this domain(vionetwork.com) on the safe list to download from.
Other than that, we haven't found any other reasons why people can't download, please check all 3 before replying here.
If some files say 'not found' I am working on those as we type