Check what data can be migrated from your current XC4-based store to a new XC5 store automatically using the XC4 to XC5 Migration Wizard. For details, see What Data Are Migrated?.
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If the Wizard fails to find the data to migrate automatically from XC4 and you need to have these data in your new XC5-based store, transfer such data manually after the data migration is complete. If you need help, contact X-Cart Team.
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Check the current server for compatibility with XC5 system requirements and enough disk space to run 2 X-Cart stores at a time. See Meeting the Server Requirements for X-Cart 4 to X-Cart 5 Migration for details.
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If your current server needs enhancements either in properties or in disk space, or even in both, make sure to upgrade the current server or switch to a better one, or perform the upgrade on your local machine if it suits the requirements.
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Install a new XC5-based store as described in the Installation Guide.
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Do not apply any customizations to X-Cart 5 before running the migration process, and also make sure to remove all demo data from the installation. You can remove existing data from X-Cart via System Tools -> Remove Data section of your X-Cart 5 Admin area.

Fine-tune X-Cart 5 advanced settings for a smooth migration process. For details, see Advanced Settings.