I don't know what the deal is... I downloaded the x64 version straight from Splunks site.
Here's a better rundown on my Putty. I renamed the file to splunk.tgz, then copied it to the /opt/Splunk/ folder via WinSCP. When I extracted it, It created the splunkforwarder folder and all underlying files/folders.
ktfs01-2# tar xvzf splunk.tgz
x splunkforwarder/
x splunkforwarder/etc/
x splunkforwarder/etc/deployment-apps/
x splunkforwarder/etc/deployment-apps/README............................etc.
ktfs01-2# cd /opt/Splunk/splunkforwarder/bin
ktfs01-2# ./splunk start
ELF binary type "0" not known.
zsh: exec format error: ./splunk
ktfs01-2#
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