It says to not use build 5160 to upgrade from version 2 version 3. Where can I find a version 3 build which will upgrade version 2 to version 3 correctly?
AFAIK there are no problems with upgrading from Parallels Desktop 2 directly to Parallels Desktop 3.0 build 5160.
I did just notice that it says this on the Leopard support page though:
NOTE: Updating to Build 5160 is only free to and recommended for existing Parallels Desktop 3.0 users. If you are using Parallels Desktop 2.5 or earlier, do NOT install the Build 5160 update until you upgrade to Parallels Desktop 3.0.
To clarify, that is saying that you shouldn't upgrade Parallels Desktop 2.5 to build 5160 unless you have a Parallels Desktop 3.0 license. It isn't saying that you need a build other than 5160 to upgrade. I can see why you would read it that way though.