good to hear that is finally working
so you went back to your web driver version 346.03.15f10
if is working then don’t worry leave it like that
but i’m sure the update 346.03.15f16 will also work
i figure out the whole thing, the problem is that i’m not running mac os and that make things a bit harder for me
but i do have good memory and i remember things
so then i remember about the CUDA version
so that was the problem you had the latest CUDA but that version was for High Sierra
basically you went a bit too high and jumped the last CUDA that is supported by your OS
i also imagined, fix the error just in case you want to sell the system
anyway about your questions
if you plan on using CUDA then the highest you can go is High Sierra
you can install Mojave or even Catalina in your system but you won’t have any CUDA support
also no web drivers in Mojave and Catalina but honestly there are not need it
because the card works fine with the native driver
so is up to you there what you want to do based on the apps you use
if you have any more question please feel free to ask
ignore the manual method , you don’t need that
all you need is installers as long as you choose the right ones then everything should work just fine
so one last time to make sure i explain good
High Sierra has web driver and CUDA support
Mojave and Catalina no CUDA support no WEB Driver support
but the card works with the native driver, the problem that most people have with that is the lack of CUDA support
specially if you do some work that requires CUDA to accelerate the workflow
best of luck
edit
i deleted the manual method just to simplify everything, i don’t want to confuse or complicate things