Oracle 8i is desupported and unavailable. The only "official" download site is Oracle Technology Network, and the oldest available version is 9i.
What do you need 8i for, Don_log? If it is a "must" (because of any kind of business requirements), you should contact Oracle Sales representative, explain what it is all about and ask for help. Otherwise, download a more recent version. Note that 9i is also an old version, so - perhaps the minimum should be 10g (how about Express Edition?), if not 11g.