Your screwed buddy. That's the norm here.
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Howdy sunshine - come to spread your joy again today?
You are perfectly fine deleting install a recovery.sh. You actually want to delete this if you are running a custom recovery with a stock kernel. That script pulls the recovery from the kernel and overwrites the custom recovery.
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This. If you are leery to delete that file for whatever reason you can always throw a .bak on it or the like as well, or change permissions on it to 000, etc. Like Nitro said, if you are running a stock (or modified-by-you version anyway) build you'll want that gone. Note though that some use that file to do other things - recent supersu installs use it to get around 4.3 root issues, you can use it to allow init.d support on an unmodified stock kernel, etc. In those cases you'd want to leave it be, but that likely doesn't apply here - just thought I'd point it out regardless