It depends somewhat on why that plus.j2a is there to begin with, but it comes down to this: don't have an earlier version of plus.j2a in a folder that JJ2+ reads from. Assuming you don't have a plus.j2a in your cache, because I can't think why you would: either update that other installation of JJ2+ to version 5.6 as well, or else remove the folder from AdditionalFileFolders.
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