When trying to have Blender 2.83 install the "rprblender" folder it doesn't list the Radeon Pro Render add on. I'm able to select the folder in "Blender > Edit > Preferences > Add Ons > Install > Downloads > rprblender" but when going back to "Add-Ons" the file isn't listed. Is their a specific file within the folder that needs to be selected to properly install Radeon Pro Render.
Radeon Pro Render v2.4
ASUS STRIX Radeon RX Vega 6
You might want to post your question at Blender.
Found this one thread at above forum that is mentioned on another thread concerning installing ProRender in Catalina:https://community.amd.com/message/2946383?q=MAC%20Catalina%20ProRender
BSAVERY is AMD Manager in charge of ProRender Project.
NOTE: I realize that this is a different problem then what you are having but it is just an example of posting at Blender AMD Forum.