Hello BillDolan,
Welcome to Microsoft Community.
I fully understand your need to use DaVinci Resolve 19, but in response to the issue you mentioned here, please allow me to kindly remind you to download and install the version for Windows ARM.
Based on the search, we noticed that the software should be compatible with arm devices:
Support Center | Blackmagic Design
The Surface Laptop 7 is powered by the Snapdragon x elite chip, which is arm based, so I'm guessing that the problem is most likely related to the mismatch between the software versions you installed.
Check the installation guide for DaVinci Resolve 19 to see if you're facing the same problem once you've installed the correct version of the software.
There are no publicly available drivers and firmware packs for the Surface Laptop 7 since its release, but if you're still having problems running DaVinci Resolve 19, I recommend reporting the issue to Blackmagic Design:
Or check out Blackmagic Design's community forums for more help:
Blackmagic Forum • Index page (blackmagicdesign.com)
Disclaimer: These are non-Microsoft websites. The pages appear to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Best Regards,
Mitchell | Microsoft Community Support Specialist