How to upgrade in a noob language

Hi again and thanks in advance,
I’m very satisfied with my OJS-System 2.4.6, but now i want to upgrade to 2.4.7.
I’m using Step 3 .Patch from the Readme UPGRADE, but when i try i get the message :
"Reversed (or previously applied) patch detected! Assume -R? [n] ", how could i fix this ? Should i do a diff data ?

Regards
Peter