Let me try to put this in order, because if I have this right then the reason is clear and I'll explain at the end:
You downloaded a tgz file from splunkbase.
You saved that on your Mac's desktop.
You logged into the VM's Splunk instance.
You clicked in that Splunk instance to apps, and installed a new one.
You picked the tgz file you saved as the file to upload and install.
It uploaded it and installed it.
If that's the right thing, more or less, then the answer is simple.
Splunk's "apps" install from a .tgz file or an .spl file. They're the same things, just renamed .tgz to .spl in the .spl case. When you install either one using the UI, it uploads it to the local Splunk instance you are on, unzips it into place, then generally asks you to restart Splunk to pick up the changes.
So, no magic. Well, no "extra" magic, anyway. It's just untarring it for you.
Happy Splunking,
Rich
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