hi
i can only help you with question 1 and 3
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i think you can move into the wall because you are using a static mesh wall, if that is the case so you have two option: go to the grid manager and enable the trace for walls option, or you can use the bp_ga_tile (it in the project) this tile have everything set inside(edge cost).
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in order to see what version you have just go to project setting in the editor and look you will see project version number. the last version is 1.91
cheers
leo