Hi Nancy,
The localhost is the machine where you have Splunk Light installed.
You should be able to start Splunk Light using a web browser as follows:
With a supported web browser, navigate to:
http://hostname or ip address:8000, or enter localhost:8000
Use whatever host and port you chose during installation.
When you tried to re-install Splunk Light, it seems you did not remove all instances of Splunk Light first (the Splunk directory), as you cannot install over an existing version unless you are upgrading.
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