Subscription licenses of Redshift are available for purchase from Maxon when purchasing a subscription of Cinema 4D. Please note that these licenses work only when using Redshift from within Cinema 4D R21 and higher and do not work when running Redshift from another host application such as Maya.
The Cinema/Redshift bundle uses the new Maxon license entitlement system and does not use activation keys. You should ignore any mention of the Redshift licensing tool or activation keys in the installer and online documentation.
Simply install Redshift and run Cinema and the license should be picked up automatically.
When you purchase a Cinema/Redshift bundle subscription, the subscription is managed as part of your my.maxon.net account. However you will need to access the Redshift website to download Redshift and receive support on our online forums.
If you already had a redshift3d.com account prior to purchasing your Cinema/Redshift bundle subscription, then your account has been granted access to the Redshift downloads.
Otherwise, you should have received an email with a link to set your redshift3d.com account password. If you have not received the email, please check your SPAM folder. Note that the links to set your account password expire within 24 hours. If your set password link has expired, you can use the forgot password page to get a new one.