How can I upgrade Windows Server 2012 Essentials to Windows Server 2012 R2 Essentials?

I have just installed Windows Server 2012 Essentials on my Home Network (from the installation DVD). I have done absolutely no configuration Installing Server 2012 was an oversight; I meant to install Server 2012 R2 Essentials.
I tried to correct by installing R2 from its DVD, hoping it would do an upgrade. That didn't work.
Is there a simple way to make it possible to install the correct OS? For example, can I just demote the existing server and remove any roles that were installed, so that the R2 disk will install over top of the existing installation?
Alternatively, is it safe to just reformat the partition and install R2?
http://technet.microsoft.com/en-us/library/dn408635.aspx seems to imply that this is OK.
David Pike, P.Eng, MCITP

Hi Larry.   Thanks for the reply. It didn't work, but I don't believe you are wrong. Rather I think there is something weird in my system. I'm marking your reply as answer.
Some background: I'm repurposing an older PC (Compaq SR1614X) as a home server, to manage my home network, use as a gateway to my Azure server, and to help my Server 2012 training (on MVA). I've been messing with it for nearly two months,
on and off. From the start, I've had trouble installing the server 2012 software (see previous threads August-27 and August-16
), but when I got to the point that I could install Server 2012 Essentials, I thought I could upgrade to Server 2012 R2 Essentials exactly as you suggest. That was where you helped me a lot, i.e. you confirmed that my expectations were reasonable.
So when it didn't work, I spent most of yesterday trying various different procedures. I got tantalizingly close, but still no cigar.
I can install any Windows Client and Server 2012 Essentials, but the R2 Essentials installation never finishes; it goes into an "error 0x000000C4" boot loop. At first I wondered if it was because I was installing a server over a
server, but you confirmed that's not the issue. I later verified that I cannot install R2 over Windows 7 either, whereas R1 over Win7 is fine. I can only surmise one of two problems:
I have a bad installation disk
There is a hardware issue
I plan to eliminate (1) by creating a new disk from a new download. I have verified that the latest ISO file and the one I have been using have identical byte counts,
For (2), I had suspected that the problem was that the older system has no UEFI, but since R1 installs OK, I am discounting that. Today's effort: to eliminate the DVD drive, I will try booting from a Flash Drive. To eliminate
the hard drive, I will try installing to a different drive.
I am hoping you can help with one more thing. When I run setup.exe with the /noreboot option, I have a better chance of success. The option suppresses the first reboot only, but that one (after "Expanding the setup files") always
fails, so suppressing it gets me almost to the end of the install. Is there a way to modify setup.exe so the it always runs with the /noreboot option?

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