David,
I can't replicate that problem at all. I am working at home and can get the download operational for any of those links without logging in.
Please try these direct links and let me know the result:
6.12:
https://dwsupport.blob.core.windows.net/supportdownloads/hotfixes/6.12/DW6.12_HotfixPack.zip
7:
http://www.docuware.com/r/download/dw7
If they still fail I will get a tech to look at this with you.
Phil Robson