I did not try Primo under Oreo or Pie.
But after reading and following my logic if the message "User interface resolution is not supported" means that even the device resolution is not supported.
If you solve the problem with the resolution (the resolution of the device is found in multimode.ini) and get a black screen and hear the specific sounds of iGO, only then can you say that primo is not compatible with SO (certainly for Oreo).
So, copy ux-utility for_S8 from [Only registered and activated users can see links. ] into folder iGO\ux.
You may not receive the "User interface resolution is not supported" message anymore, but just a black screen and hear the specific sounds of iGO.
It means you have solved the problem of resolution, but you can not use primo because of OS, I do not know how much would satisfy you.
That was just a thought, yet I would bet on a cold (virtual) beer box that if you Pie would work.
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