bmoon wrote:
-  Can I upgrade straight from 2.5.1 to 2.5.3, or do I need to step to 2.5.2
first, then 2.5.3?

You can upgrade straight from any supported old version (2.5.1) to the new version (2.5.3), the upgrade procedure will go through all intermediate steps.

-  The readme for the Linux Unified Installer says that "installer-based
automatic upgrades are not supported", and I'll have to copy over my Data.fs
and third-party products to a new folder.  But the upgrade doc I found on
plone.org says that if you're using "the installers", you shouldn't have to
worry about that.

The recommended procedure is documented in:
http://plone.org/documentation/manual/upgrade-guide

I don't think this document says that.

It makes it sound like I've got to effectively do a new Plone installation
just to migrate.

Yes, and move Data.fs over and so on.

> If so, then I've got to really plan for my site to be down
a while

You should prepare the upgrade in a test environment. Once it's all prepared, repeating the procedure in the production environment shouldn't take more than a couple of minutes downtime.

--
René
http://www.applinet.nl

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