: Right-click setup.exe and set it to run in compatibility mode for Windows XP (Service Pack 3) or Windows Server 2003 .
: Ensure your PATH includes the client directory and set the TNS_ADMIN variable to point to your tnsnames.ora file. Critical Requirements for Modern Windows Oracle 9i Client Download For Windows 10 64-bit
If your application specifically demands the actual 9i client (32-bit), you are entering "workaround" territory. Users have successfully forced the install using these steps: : Right-click setup