A true portable app leaves no traces in the host system—no registry entries, no hidden folders in AppData , no installed drivers, and no services running in the background.
October 24, 2023 Subject: Analysis of Cinema 4D R26 "Portable" Editions
Most "portable" versions found online are unofficial repacks created by third parties. These are often used to bypass the subscription cost ($59.91/month or $719/year). Amazon.com Risks of Unofficial Portable Versions
Purchase a Maxon One subscription (approx. $99/month or $79/month annual) or a Cinema 4D subscription.