Dragging and dropping a c2addon into layout does not prompt plugin install.
This is certainly not a bug as I installed this exact plugin (FGL) 3 days ago, though since then I have factory restored my PC, on attempting to reinstall everything I noticed I could no longer drag and drop install.
I am using C2 r173 on Windows 7 64-bit, with an activated personal licence.
Is there any other way to get a c2addon file to work? File association yields no results.
Thanks for your time.
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Just unpack the c2addon file with winzip or 7zip.
You will see a files folder which has the plugin or behavior folder inside. Just drag it to the relevant folder in you C2 installation.
Is it a valid .c2addon file? If not then it won't work. There is nothing we can do unless you provide the file, so closing.