How it is done: I managed to upgrade from 4.3 to 5.1 manually, I replaced all the dlls in Bin folder, and the Composite Folder in the root of the website. Added the missing files and folders from Composite C1 v5.1 build. After that comes the tricky part. You have to merge carefully Web.config in the root folder and Composite.config in the App_Data/Composite. Was lucky enough to avoid errors in the configuration files. Hope it helps someone
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