@ienjoywhiskey: Hey, sorry for the late answer. I’ll try to answer your questions.
For your first question, I think it will not be that straightforward to drop an existing project into the new update. It will probably be easiest to copy over any changes you mande one by one and testing each step/modifying as necessary. The toolkit has not changed so much that porting added features should be that difficult, but even the fact that I’ve changed quite a few variable and function names to better comply with Epic’s scripting standards means that directly copying over will not work in most cases.
For your seestion, the MakeTilePassable function should work well for what you are trying to do. Run it for the appropriate tile after destroing the actor occupying it. After that you can modify its tile costs either by using Spawn Tile for a tile with the correct indexes, or edge by edge by using Get Adjacent Indexes and Set Edge Cost.