February 2024 Release (Version 24.2) Issue: After Effects 24.1 included an upgrade of the Cineware plugin that broke the compatibility of projects utilizing .c4d files, the Cineware effect, or the Cinema 4D Renderer. After Effects 24.2 includes an update that restores compatibility with projects created in After Effects 24.0 or earlier. However, those created in 24.2 or later will not open in version 24.1. Conversely, those created in 24.1 will not open in other versions. Workaround: This is a known issue, and we recommend you upgrade to After Effects 24.2.1 to use files from 24.0 and earlier. For ones created in 24.1, use After Effects 24.1. for real :((
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