Downloading Oracle Client 8.1.7 (Oracle 8i) is no longer possible through standard official channels, as the software is long "desupported" and removed from modern download pages. To help you navigate this legacy challenge, here is the "story" of how to handle such an ancient requirement. Oracle Forums The Reality: Official Availability
Oracle distributed the client on CD-ROM as part of “Oracle 8i Enterprise Edition for Windows NT” – CD 2 of 3. The ISO name often is Oracle8iR3_win32_client.iso . download oracle client 8.1 7 windows
If you absolutely must use it:
Most professionals still using 8.1.7 rely on original installation CDs or ISO images stored in company archives. Downloading Oracle Client 8