To resolve this issue, you will need to do this:
- Abort installation.
- Copy all folders and files in your \winx64_12102_SE2_database_2of2\database\stage\Components\ folder to \winx64_12102_SE2_database_1of2\database\stage\Components\.
- Initiate installation again.
Please do not ask me why the need for this silly step. It is just how Oracle package their installation files. I would recommend them doing a ISO file instead of doing 2 ZIP files!