After download rhino6, open rhino5 has problem

Hi, everyone

This is my first time write in Rhinoceros forums,
if i write at wrong place please let me know i will delete

i need for technical support
After after download rhino6 and penneling plugin
if i open rhino5 64system show up plugin load message

Rhinoceros 5.0 Plug-in Developer run time debugging
Plug-in commands must pass a pointer to their parent plug-in
Your command class constructor should look like:
MyPlugInCommand=MyPlugInCommand(): CRhinoCommand( false, false,=PlugIn() )

and couldn’t see rendered mode.
thankyou so much

Hearean Sun