AssetsParadoxNotionCanvasCoreFrameworkDesignEditorWindowsGraphEditor.Toolbar.cs(108,78):error CS0103:The name'FindObjectsSortMode'does notexist inthe current context
If selecting “No” to auto-upgrade:
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AssetsParadoxNotionCanvasCoreFrameworkDesignEditorWindowsGraphEditor.cs(235,76):error CS0234:The type ornamespacename'PrefabStage'does notexist inthe namespace'UnityEditor.Experimental.SceneManagement'(are you missing an assembly reference?)
Your Unity Asset Store page lists it as compatible from 2020.3 and up, and it definitely is not. Screenshot below as proof.
Edit:
FindObjectsByType was added in release 2021.3.18: https://unity.com/releases/editor/whats-new/2021.3.18 , however the use of this call is not wrapped in a conditional and the developer lists 2020.3.48 as the minimum supported version.
I am using Unity 2020.3.48f1. It is the version I am working on NodeCanvas and the one that asset store submissions are being done, and Unity 2020.3.48f1 DOES support this new API. This is why it is also shown as the minimum compatible version as well.
It is a really weird move from Unity that newewer Unity version do not support this API…