Hi!
Hope you all had a great holiday season 
- core dlls are indeed shared across engines. For the UE plugin you can either get it from the binary release or compile it yourself.
- You need a special license to get access to the source code. (https://simul.co/main//)
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Does any of the things said above help?(the conversation with ) it seems to be related with it. Are you still having the inverted?
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I will make a test with streaming and see if I can catch it.