click the button to download rhino.io for Cinema4D versions 11.0, 11.5 and v12.0 (needs a valid rhino.io license to run, see menu “BUY”),
unzip the file and place it in the Cinema4D plugins folder, start Cinema4d. under plugin menu chose register rhino.io.
this opens the web browser to the register page, register there with correct data. you get the final c4d serial per email within 2 minutes (the first sales email with register code comes normally at the same day within few hours during workdays, on weekend and official holidays it can take longer until next workday)
restart Cinema4D, enter this license in the register/personalize dialog that pops up.
if you need help feel free to call or email us.