Hi,
I have a similar problem. Da Vinci Resolve won't open after successful installation, withe error message saying that "DirectML.dll" file is missing. I tried to put the file you've shared by dropbox in C:\Program Files\Blackmagic Design\DaVinci Resolve,
but then, when i try to relaunch the app, another error message says that the procedure entry point "d3d12serializeversionedrootsignature" could not be found in the dynamic link library C:\Program Files\Blackmagic Design\DaVinci Resolve\DirectML.dll
Also i'm using the 18.6.4 version of Resolve.
Here's my computer system information :
https://we.tl/t-i9RUVNbrii(there is only the NFO file and no log fila cause i couldn't make the CaptureLogs work (or can't find the file)
Do you think you can help ?