You are using the correct Download Link (the one above the
Donate Support button)
All download versions look similar to this (attachment). Only the OS version Icon will be different.
Other reasons that come to mind (only that affect specific URL's):
1) erroneous entry in the systems 'Hosts' file
(if you don't know what a 'hosts' file is, YOU did not do this)
2) Malware (could have caused #1)
3) Parental controls setting
4) Firewall (host filter) setting