VapourSynth consists of two parts:
1) The core and the API it exposes. It can be used by any application and is unaware of any scripting at all.
2) vsscript - a Python module which is installed into Python distribution and is loaded BY Python when the script is evaluated.
So, VapourSynth installer needs to know where Python is installed. And vsscript needs to know where the core is installed. Thus, no portable version.
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...desu!
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