Upgrade or Custom choice when installing Windows Server 2012 R2

I'm in the process of installing Windows Server 2012 R2 onto a separate partition.

The OS running on it now is Windows 8.1 Pro with Hyper V enabled.

At the very minimum I want to preserve 8.1 if I need it to multiBoot and save my Windows 8.1 installation.

My preference of course is to use both Win8 and the server using Hyper V at the same time.
MS Help files on the installation choice are not as clear as i'd like, at least not to me.

So my only question, when installing Windows 2012 R2, should I select UPGRADE or CUSTOM installation?

I'm ready to install so someone please answer ASAP.
Grover McBroomAsked:
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Scott CSenior EngineerCommented:
Custom.  Then choose a different drive for the installation location.

Upgrade will blow away your current installation.
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Grover McBroomAuthor Commented:
Thanks for the quick answer. On my way to install.
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Norm DickinsonGuruCommented:
I don't believe the upgrade path is supported for Windows 8.1 Pro to Windows Server 2012 R2.  See https://technet.microsoft.com/en-us/windowsserver/dn527667.aspx?f=255&MSPPError=-2147217396 for a list of software that qualifies to use the upgrade method.

What you want to achieve may be best done by following the relevant steps here: http://blogs.technet.com/b/blainbar/archive/2012/09/25/step-by-step-4-ways-to-dual-boot-microsoft-windows-8-and-windows-server-2012-with-or-without-windows-7.aspx
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McKnifeCommented:
Upgrade can only be used for upgrading 2012 to 2012R2. Upgrades never blow away anything, they transfer your setting, files and programs, even - but only when the rich OS is detected and we start setup while the former system is booted. If not, upgrade doesn't lead anywhere.
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