Folders in the system Library

I have a folder in the System > Library folder named Filemaker Server. It is imperative that I am able to delete (or rename) this folder so I can reinstall Filemaker server.

I am unable to remove or rename this folder!

I have Admin privilege on the computer.

How do I get privilege to change this folder?
Assuming this is related to SIP and Filemaker wasn't evicted from /System (which I think it should have been, depending on your version of macOS), it was probably marked with the extended attribute com.apple.rootless which protects system files from being manipulated. I've seen some machines with the protection applied to some files incorrectly on early versions of High Sierra, but are you sure you can't delete it as the root user?
Have you asked Filemaker support about the issue, because deleting it may be unexpected for your installation?
Otherwise you would have to boot into recovery and delete it from the command line.
Folders in the system Library
 
 
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