Afaik, the "key_xe.reg" part actually works i.e. KEY_XE node is created and populated. It's the error message that's misleading.
I've seen a post somewhere about suspicion of (non-vital) meta content for the installer going missing in connection with the error message, but I guess that's the least of issues when installing on unsupported platform.
1. Start the installer ‘Setup.exe’. Wait until asked about the path.
2. Do not press next. Open with Windows Explorer the folder like this:
3. There will be a file
OracleMTSRecoveryService.reg. Make a copy and rename the copy to KEY_REG.reg
4. Go to the installer and go ahead with the installation.
You will not see any error about the
It helped me,