should i delete the install folder?

No need to, though there's really no harm if you do. Installation is locked and the upgrade is password protected.
I dunno... Being a guest without authentication, going to that link directly at:

http://www.YOURDOMAIN.com/install/

results in this:

xenforo_install_dir.jpg


And that scares me enough that any anonymous user can hit that 'Rebuild Master Data' button or... the 'click here' link...

So my temp solution to this is: chmod 0000 install/
 
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