I’m using a laptop. When I click the “Connect to D5 Render” button in SketchUp, it loads for a while and then a “PROGRAM STARTUP FAILED” warning pops up.
Thinking it might be a graphics card driver issue, I updated the driver to the latest version. After the update, the “PROGRAM STARTUP FAILED” warning no longer appears, but now D5 Render just stays on the loading screen indefinitely and never actually opens.