It's not an install package, it's a checksum that lets you verify that the install package you downloaded was downloaded correctly.
For instance, this is what the MD5 sum file for the x86 install of the Universal Forwarder v4.3.3 contains:
$ cat splunkforwarder-4.3.3-128297-x86-release.msi.md5
86353f3acf1ee9230ebdfc026ee80821
And this is what you get if you calculate an MD5 sum for the actual (correctly) downloaded package:
$ md5sum splunkforwarder-4.3.3-128297-x86-release.msi
86353f3acf1ee9230ebdfc026ee80821 splunkforwarder-4.3.3-128297-x86-release.msi
By comparing those two sums, you can verify that your download is correct.
It's not an install package, it's a checksum that lets you verify that the install package you downloaded was downloaded correctly.
For instance, this is what the MD5 sum file for the x86 install of the Universal Forwarder v4.3.3 contains:
$ cat splunkforwarder-4.3.3-128297-x86-release.msi.md5
86353f3acf1ee9230ebdfc026ee80821
And this is what you get if you calculate an MD5 sum for the actual (correctly) downloaded package:
$ md5sum splunkforwarder-4.3.3-128297-x86-release.msi
86353f3acf1ee9230ebdfc026ee80821 splunkforwarder-4.3.3-128297-x86-release.msi
By comparing those two sums, you can verify that your download is correct.
Mate, your a King!
I just wonder why they don't give us the checksum instead of having to download it?