So I discussed about your issue with a developer, to see what we could do. Here a few new questions:
- Do you confirm that you can import anything except presets (smart materials, smart mask, brush presets) ?
- If you copy manually the Smart Materials into your installation folder (in the right location) do you still get the error ?
- Can you open the Smart Materials in other applications, such as notepad/notepadd++ ?
- Can you try to run the following command from a command line window open in Substance Painter folder :
"Substance Painter.exe" 1> output.txt 2>&1
Then import the resource that fails and after that attach the output.txt file here.