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Please do not split topics across several threads. This makes following the conversation in the threads view very hard as the context of the other messages is missing. If you have additional information either edit the original message or post to its thread. Regarding the problem, yes, it is intended, otherwise existing builds would break. The 404 is caused by you using the wrong coordinates. The actual code coordinates of that plugin changed in version 4.x so the 404 is exactly right.