Hi,
I just updated from 1.86.1 to 1.86.2 and got 5 compile errors plus a couple of warnings. I haven't modified any AC scripts myself, so this is a clean update on a working project.
Here are the messages:

    Errors:
    Assets/AdventureCreator/Scripts/Actions/ActionSpeech.cs(81,76): error CS0103: The name 'newHashSet' does not exist in the current context
    Assets/AdventureCreator/Scripts/Actions/ActionSpeech.cs(82,78): error CS0103: The name 'newHashSet' does not exist in the current context
    Assets/AdventureCreator/Scripts/Actions/ActionSpeech.cs(955,9): error CS0815: Cannot assign void to an implicitly-typed variable
    Assets/AdventureCreator/Scripts/Actions/ActionSpeech.cs(961,10): error CS0815: Cannot assign void to an implicitly-typed variable
    Assets/AdventureCreator/Scripts/Actions/ActionSpeech.cs(1245,34): error CS0103: The name 'lipSyncHandles' does not exist in the current context

    Warnings:
    Assets/AdventureCreator/Scripts/ActionList/Editor/ActionListAssetEditor.cs(602,38): warning CS0618: 'EditorUtility.InstanceIDToObject(int)' is obsolete: 'InstanceIDToObject(int) is obsolete. Use EditorUtility.EntityIdToObject instead.'
    Assets/AdventureCreator/Scripts/Managers/Editor/ManagerPackageEditor.cs(48,36): warning CS0618: 'EditorUtility.InstanceIDToObject(int)' is obsolete: 'InstanceIDToObject(int) is obsolete. Use EditorUtility.EntityIdToObject instead.'
    Problem detected while importing the Prefab file: 'Assets/AdventureCreator/Prefabs/Automatic/MainCamera.prefab'.
    The file might be corrupt or have a missing Variant parent or nested Prefabs. See details below.
    Warnings:
        Component at index 2 could not be loaded when loading game object 'MainCamera'. Removing it.

I did some research but decided not to edit AC scripts directly. Could I get some advice on these issues?
Thank you!

Unity version: 6.3 LTS