If it’s not already done in the latest JUCE could someone please add error reporting to stderr for the juce_vst3_helper.exe with as much verbose detail as possible. It’s almsot impossible to debug build errors without it as the post-build script just fails without any information.
In this case I think it was a crash (caused by a third party copy protection tool), so ideally we’d have a crash handler in the vst3_helper that’d just display ‘plugin crashed’ i guess? 
I’m working on some changes to this that I hope to share soon.
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