Due to frequent files and folder restructure, you should remove the previous installation folder and re-import FlowCanvas anew. It is highly recommended to always keep a project backup before upgrading as well! – v3.4.2 – Mod: Unity 6.5 support. – v3.4.0 + 3.4.1 – New: Initial decoupling of FlowGraph and FlowScript thus making it possible … Continue reading Change Log