How do I install legacy Red Giant products? - Knowledge Base
To download Cinema 4D R18 legitimately, the correct path is through Maxon (your Maxon account or support), an authorized reseller, or educational channels if you have a valid license. Avoid torrents or cracked copies due to legal and security risks. If compatibility or licensing problems arise, contact Maxon support or consider upgrading to a current release or using Blender as a free alternative. Download Cinema 4d R18
Maxon no longer lists R18 on their main site, but: How do I install legacy Red Giant products