Clustered Install of SQL2K14 with SP1 on Windows Server 2012

Remember the command you (Alberto M.) showed me to slipstream SP1 onto SQL2K14 SP1?

It worked well. (below is the command).  But when I run it on a W2K12 WSFC cluster it tells me over and over that I either don't have permission, or it can't find the .exe file containing SP1.

Is this SUPPOSED to work, or is a gotcha?   I'm running on W2K12, not R2.

Thanks.

C:\Software-Resources\SQL2K14\setup.exe /action=install /updateenabled=TRUE /UpdateSource="C:\Software-Resources\SQL2K14-SP1\SQLServer2014SP1-KB3058865-x64-ENU.exe"