Because native install fails, you need a virtual machine with or Windows 2000 Professional (32-bit). Here’s the proven method:
Oracle has removed 8i from its public download servers due to its desupported status. oracle 8i download for windows 10 64bit link
If you run the setup.exe directly on Windows 10 64-bit, you’ll see: “This app can’t run on your PC” or a cryptic “16-bit subsystem missing” error. Because native install fails, you need a virtual