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Staged upgrade

SDL Web supports a staged upgrade: you upgrade your Content Manager first, and perform an upgrade of your Content Delivery software components, one machine at a time, after your Content Manager upgrade is completed. A staged upgrade is possible for all releases from which you can upgrade to SDL Web 8.5, that is, SDL Tridion 2013 SP1 HR1 or SDL Web 8 with Cumulative Update 1 applied. SDL strongly recommends against attempting a staged upgrade on your own; instead, you should contact your SDL representative first.