If you are an Adobe After Effects user, you already have access to Cinema 4D Lite , which can be activated through your Maxon account.
Viewport flickers with complex NURBS. Fix: Go to Preferences > Viewport > Display > set "Anti-Aliasing" to Off. Use the Picture Viewer for final quality.
— You can download a fully functional 14-day trial of Cinema 4D 2025 (much newer than R25) from Maxon’s official website: → https://www.maxon.net/en/cinema-4d