Before you install
If you're installing Splunk on a Windows system, make sure that any anti-virus software is turned off. You can enable it again after the install is done, but be sure to configure it so that it doesn't attempt to scan either the Splunk installation directory, or any file accesses by Splunk processes (basically, any process that begins with "splunk".)
If you're upgrading from an earlier version of Splunk, review the information in "About upgrading to 4.3: READ THIS FIRST" before proceeding.
About Splunk Enterprise licenses
This documentation applies to the following versions of Splunk® Enterprise: 4.3, 4.3.1, 4.3.2, 4.3.3, 4.3.4, 4.3.5, 4.3.6, 4.3.7