SCCM 2012 R2 SP1.... must have SP2 installed ?

If I logon to MSDN downloads (which is my only option now TechNet downloads is gone) I see this

I stupidly thought it would be SCCM 2012 R2 SP1....

The file name also made me think it would be SCCM 2012 R2 SP1

But, I was wrong....

Apparently to install SP1, I must have SP2 installed.

What you actually need is the iso titled mu_system_center_2012_configuration_manager_and_endpoint_protection_with_service_pack_2_x86_x64_dvd_6677749.iso

Why am I downloading SP2 media to move to SP1?... well, that's a good question - and one that only Microsoft can answer.

The media will move SCCM 2012 (non-R2) environments to SP2 and SCCM 2012 R2 environments to SP1...

Makes perfect sense.