How to install both C51 and ARM together?

Hi,

I have already installed ARM mdk473 in my PC, now I was installing C51v952 and am getting a message asking " A new version of C:\Keil\UV4\SVDConv.exe is already installed" and it asking to choose "skip, Replace, Replace All"

Which should I choose?
Is this is the correct way to install two different tool chains?

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