Not working with R21, S22

[MikeUdin]

Cinema 4D versions and their corresponding Python versions:

Cinema 4D Version	Python Version
R20, R21, S22	CPython 2.7
R23	CPython 3.7
S24, R25, S26	CPython 3.9
2023.0, 2023.1	CPython 3.9
2023.2	CPython 3.10
2024.0 and later	CPython 3.11

[ttiimmaacc]

Thanks for reporting!

The project targets Cinema 4D 2025 which runs on Python 3.11.
Older versions like R21 / S22 are based on Python 2.7 and are not compatible with the current codebase.
Supporting R21 would need major rewrites using legacy APIs and syntax, which isn't currently planned.

Backward compatibility is planned for Cinema 4D 2023.1 + (Python 3.9 onward). I've added a table to the README for clarity.

🙏