Because we already did (ultim wanted to contribute to the 2.6 codebase before creating the fork).
We want to support new colorspaces and keep compatibility with existing 2.6 plugins. Starting from 2.5.8 codebase or rewriting everything IanB wrote during these 6 years would delay new features quite noticeably and that's a lot more important to the end users than some silly licensing question.
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Me on GitHub | AviSynth+ - the (dead) future of AviSynth
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