You didn't say whether this is your lab or for your business or what. Some things you can do: License Splunk Enterprise and install the Enterprise license. This gives you support and so on, but is probably out of reach for personal budget. If this is your NONPRODUCTION lab environment and you can abide by the terms of the development license, get a development license. See https://dev.splunk.com/enterprise/dev_license. Put a reverse proxy like Nginx in front of Splunk's UI. Move Splunk to 127.0.0.1 on an alternate port. Make the reverse proxy do authentication. Note this still leaves you with an extremely limited Splunk Free that does not have scheduling or alerts or all of the other features you'll be missing. This requires a little sysadmin skill to pull off successfully.
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