Since you refuse to join the 21st century (i.e., the cloud
![Wink ;)](https://forum.luminous-landscape.com/Smileys/default/wink.gif)
), it requires a bit more steps:
1. From the LR Mobile, choose: Export Original
2. Destination: Files
3. Choose: On My Phone (select any appropriate folder there)
Once the original file is there, you can transfer it to your iMac using any traditional method, e.i., AirDrop, email, etc.