The wget command that I got from the download page is an http connection, not https, and it works as expected.
green@fat ~ $ wget -O splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm 'http://www.splunk.com/bin/splunk/DownloadActivityServlet?architecture=x86_64&platform=Linux&version=6.2.2&product=universalforwarder&filename=splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm&wget=true'
--2015-03-11 10:17:22-- http://www.splunk.com/bin/splunk/DownloadActivityServlet?architecture=x86_64&platform=Linux&version=6.2.2&product=universalforwarder&filename=splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm&wget=true
Resolving www.splunk.com. 54.192.140.45, 54.192.140.114, 54.192.140.61, ...
Connecting to www.splunk.com|54.192.140.45|:80. connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: http://download.splunk.com/products/splunk/releases/6.2.2/universalforwarder/linux/splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm [following]
--2015-03-11 10:17:23-- http://download.splunk.com/products/splunk/releases/6.2.2/universalforwarder/linux/splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm
Resolving download.splunk.com... 205.251.215.40, 205.251.215.22, 205.251.215.97, ...
Connecting to download.splunk.com|205.251.215.40|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 13912657 (13M) [application/x-rpm]
Saving to: `splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm'
100%[=====================================================================================================================================>] 13,912,657 8.23M/s in 1.6s
2015-03-11 10:17:25 (8.23 MB/s) - `splunkforwarder-6.2.2-255606-linux-2.6-x86_64.rpm' saved [13912657/13912657]`
If you are concerned about the validity of the package you can also wget the md5 or sha512 has by appending the appropriate extension to the end of the file name
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