the topics for upgrading within a version range (4.1 -> 4.1.x) were inadvertently left out of the 4.1 manuals, thanks for noticing. i've added them back in:
http://www.splunk.com/base/Documentation/latest/Installation/UpgradeSplunkonLinux,Solaris,FreeBSD,AIX,andMacOS
http://www.splunk.com/base/Documentation/latest/Installation/UpgradeSplunkonWindows
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