problems with the installation of elk and other plug-in of grasshopper

Hello.

I have a problem.

I have downloaded Elk and other plug-in of grasshopper from www.food4rhino.com and i have copy files in C:\Program Files\Rhinoceros 5\Rhinoceros 5 (64-bit)\Plug-ins

I have modified the authorizations because the files were "blocked" (as i found here http://www.food4rhino.com/project/elk?etx),

but when I opened Rhino and grasshoper, the new funciton of new plug-in didn't appear.

Can you help me, please?

Sorry for my "bad" english.

Thank you very much