Ensure all Gigabyte SDK DLLs are present (see Dependencies).
Attempt running the tool in an elevated command prompt.Verify you're using a supported motherboard.RGBFusionTool.exe -verbose -zone=0 -cycle=32 -zone=1 -cycle=16 -zone=2 -cycle=8 -zone=3 -cycle=4 NET Core 3.1, then copy the build output to a single directory.
Get GvBiosLib.dll, GvDisplay.dll, and GvLedLib.dll from a Gigabyte RGB Fusion Utility (the version of GvLedLib.dll included in SDKs 18.1004.1 to 19.0311.1 have a missing dependency on GvIllumLib.dll) Get GLedApi.dll, YccV2.dll, and layout.ini from Gigabyte's RGB Fusion SDK.
You can build RGB Fusion Tool locally (see below), install it as a Chocolatey package ( choco install rgbfusiontool), or extract one of the builds listed on GitHub Releases.