I have previous versions of Vanilla installed, can I get the files of version 2.1.11 and overwrite particular core folders in order to get the security updated ?
If you have vanilla installed , then why are you asking how to install ? If what you want is to update read the forum ffs. There are literally millions of discussions precisely about this.. Just in case you don't know how to read or search:
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I've told him to read things before, doesn't bother.
grep is your friend.