In that case, you need to supply the full path, for example in your case: "C:\Program Files (x86)\FreeRapid-0.9u4\frd.exe --debug"
Make sure the double quotes(") are included, because the path contains spaces.
BTW can you download the file via browser?
Make sure the double quotes(") are included, because the path contains spaces.
BTW can you download the file via browser?