iMac Pro - BootCamp Driver (Reinstall Issue with 6.5 & 6.7)

Hmm, you might try the following, though whether it's worth the effort only you can judge:

1. Back up your user files on your Boot Camp partition, remove the partition using Boot Camp Assistant, then re-install Boot Camp, but do not yet run Apple Software Update in Windows. This should give you an Apple-updatable Windows configuration.

2. Back up your entire Boot Camp partition using Winclone 7, which supports incremental imaging. (Make sure you have chosen to create a WIM-based backup image, not a block-based image.)

3. Create a Windows restore point (just for good measure).

4. Open Apple Software Update, but do not Update; instead, select the preference to download selected updates only, and then download the updates from Apple you want to apply. Use the command in Apple Software Update to open the downloaded updates folder, and copy them to a safe place. Then open each downloaded update to apply it.

5. Run Winclone 7 again and make an incremental image backup. This should backup only the files that have changed since your previous Winclone 7 WIM backup, and allow you to restore either state at will. Test the Apple drivers to your heart's content.

6. Create another Windows restore point.

7. Install Mat's BootCampDrivers.com drivers (following whatever procedure he recommends).

8. Run Winclone 7 again and make yet another incremental image backup.

9. Create yet another Windows restore point.

10. Test Mat's drivers to your heart's content.

Between Winclone 7 incremental backups and Windows restore points, you should be able to switch back and forth relatively quickly and easily, once you've gone through the initial hassle of reinstalling Boot Camp and making your first (and therefore much the longest) Winclone backup.

Disclaimer: Note that I don't have an iMac Pro, nor have I bothered to do all this myself, so I make no promises, but I think it should work. In fact, I bought Winclone 7 when it was released for the very purpose of testing different driver versions, but just haven't got round to it yet.

If you decide to try this method, or if you come up with a better one, please let us know how it works out!