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An automated guess is that docs.umbraco.com/umbraco-cms/fundamentals/setup/upgrading/ could be the link to the new documentation for Umbraco 9 and newer versions.

    Upgrading existing installs

    Covers the steps to upgrade your copy of Umbraco to a newer version.

    General upgrade instructions

    General upgrade instructions which must be followed for each upgrade. Usually, upgrading involves copying a few files and updating config files.

    Version specific

    This lists extra steps you need to take for each version since 4.6.1.