The page is in French so you'll have to use google translate.
It adds an entire engine you need to use so make sure you read the instructions there
https://rgss-factory.net/2012/04/07/xpvxace-mgc-iso-engine/
Here's also another one for vx ace called layy meta engine which makes the game 3d with a rotating camera:
https://rgss-factory.net/2013/07/27/ace-layy-meta-engine-editor-3d-isometric-maps/
Here's where I found all of this:
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