Unfortunately the Photo 10.5 and the Apple Photos Extension is not available on Mac's running the latest OS Sierra from Apple. The Photo 10.5 and Apple Photos Extension is only available on Macs running Yosemite (10.10) and El Capitan (10.11). However, you will still be able to run the Photo 10.5 on your Mac running Sierra as a standalone application along side Apple Photos.
The new Photo RAW is the only ON1 program that is compatible with the Apple Photos Extension on the latest OS Sierra from Apple. The Apple Photos and Photo RAW extension is also available on Macs running 10.10 and 10.11.
We apologize for this inconvenience.