Official support for Oracle 8i has been dead for years. You will not find it on the standard Oracle Software Delivery Cloud download page alongside Oracle 19c or 21c.
If your organization has an active support contract, you can raise a via My Oracle Support to request the media. Oracle generally does not provide public download links for obsolete versions like 8i on the Oracle Technology Network (OTN) . 2. Community Archives (Unofficial) oracle 8i download for windows 10 64bit link
If you require Oracle 8i for legacy data recovery or academic research, consider these workarounds: Java Archive - Oracle Official support for Oracle 8i has been dead for years