Hi there Colin,
Very nice question.
Best sequence would be :
1. Boot into the "Don't use" maintenance OS (or any of the others for that matter);
2. Make a copy of your current OS file (probably MyW10-14393);
3. Boot your normally used OS (14393.0) into BASE;
4. From there boot into Normal OS;
5. Apply the patch (UnRar the UPgradePatch file over your XX folder (XXHighEnd\2.xx for RAM-OS);
6. Start XXHighEnd to see wether all still works (no playback required);
7. Boot into MinOS;
8. From there boot into RAM again.
9. Happy listening !
Ad 7:
Prior to this step, change the BIOS for ALL cores to be active (I am not sure how your Mach III was delivered, and obviously I don't know whether you changed the BIOS yourself regarding this; so goof do check.
Later, when normally booted (step
you can set the number of cores in the Boot Menu (that again requires a reboot). Obviously this (Ad 7) is not part of the upgrade, but a kind of prerequisite to optimally utilise the upgrade to 2.11.
Good luck !
Peter