Borderlands 2 community patch 4.0

how do i know, that the community patch 4.0 did work ?

I suggest you ask any questions about the UCP in the dedicated thread for it:

I doubt you’ll get much of a response in the tech support area because the UCP obviously isn’t an official GBX thing.

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Short version is that you need to enable the console and activate the patch everytime you start the game. The thread @VaultHunter101 linked to has all of the relevant information. Enabling the console requires you to use a hex editor on the exe so we can’t discuss how to do that here.