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Flash Player generally requires Administrative privileges to install, and you're probably not running with Administrative privileges on the school library's computers.
You will need to ask someone with admin privileges to update Flash Player on the computers, or if they're centrally managed by the school's IT organization, you'll have to wait for them to push out the patch. In administrated environments with large numbers of computers, system administrators will often wait to test that all of the important things that the school needs continue to run as expected before pushing out a new patch.
Thanks may be its blocked by administration.
i try my best but not installed.