DXO 4 won't open OM-5 camera raw

DxO PhotoLab
1

Do I have to buy a new version to work with my new OM-5. I currently have DXO Photo Lab 4.

2

Yes, PL4 does not work with the OM-5.

Here is a link to the compatibility checker: Appareils supportés - DxO

Just select “OM System” as the brand and “OM-5” as the model, and you’ll see 5.7.0 is the lowest version of PL that supports that camera.