Upgrading from v5.1 to v5.2

[Ranga Nathan]

I am told that to go from z/VM v5.1 to v5.2, one would have to get the 
v5.2 and install from scratch. Is this so?
If this is the case, how would I preserve the user directory and other 
files?

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Ranga Nathan
Work: 714-442-7591