If people ask this type of question it means they probably don't know how to do it themselves, and certainly don't know if it's safe to do so. As the PMMP team have been repeating endlessly on the forums, blindly bumping the API version for a plugin is not the answer, so please don't advise people to do exactly that. The best solution is to contact the developer, and if they don't reply you can fork it, try to update, ask for help here if you get stuck showing exactly the problem you are having, and then submit a PR so that everyone can benefit.
Why not try the new WorldEditArt 4 for API 3.0.0-ALPHA8 instead? https://poggit.pmmp.io/ci/LegendOfMCPE/WorldEditArt The wiki is here: https://legendofmcpe.github.io/WorldEditArt/v4.1.0.html