Okay, here is a Step by Step Tutorial.
1. You download the Plugin
2. You need a Decompiler (for example: jd-gui)
3. You put the .jar into the Decomplier
4. You saved the Decompiled or copy and paste it.
5. Save the Project.
6. Upload it on the Server
7. Fix Errors if the Console tells
8. Upload the Fixxed Version
9. Work is done.
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