Hello 
I have both HB 1.8.0 and HB Legacy installed on my machine together with Accelerad . Today I noticed that Accelerad was not working for the 1.8.0 version and after a couple tries i though uninstalling Radiance and reinstalling it was the smartest solution. I reinstalled it in the C:\Users[USERNAME]\ladybug_tools\Radiance path while the one for legacy is in the classic C:\Radiance path.
However, now 1.8.0 cannot seem to find it (and it says that my version of Radiance is old, rightfully so):
I tried many times, also changing the file in C:\Users[USERNAME]\ladybug_tools\python\Lib\site-packages\honeybee_radiance\config.json to clearly show the path but it doesnt seem to work.