Splunk Light 6.3.0 is currently available as a cloud service only. The latest downloadable version of the product is 6.2.6. An updated downloadable version will be posted on splunk.com when it becomes generally available.
We have unpublished version 6.3.0 of the Splunk Light Installation Manual to prevent further confusion.
Thank you for your answer. I can wait a week to install if it is expected that Splunk Light 6.3.0 availability will be announced at .conf2015. Can you comment on whether this is consistent with past Splunk point version updates? Thanks again.