Use this recommended procedure for performing an upgrade.
Alfresco upgrade paths
When you upgrade Alfresco, it is recommended that you follow a structured upgrade path between versions.
Upgrading from Alfresco Community Edition
Any GA (General Availability) release of Alfresco Community Edition can be upgraded to the latest version of Alfresco One that includes the same Content Repository version family.
QuickStart upgrade guide
Use this information to upgrade Alfresco on a single instance and in a distributed and clustered environment.
Upgrade prerequisites checklist
This checklist describes the requirements and prerequisites necessary to begin planning for upgrading an existing Alfresco version to Alfresco One 5.1.5.
Use this procedure to upgrade from a previous version of Alfresco. The process involves a new installation of the Alfresco binaries and configuration, and an in-place upgrade of a copy of the repository.
Use this information to migrate the search subsystem during an upgrade to Alfresco One 5.1.5.