To ensure that the installation can properly process, you should take these following preparation steps carefully.

– We strongly recommend you to duplicate your live store on a development store and try your installation on it in advance.

– Backup Magento files and the store database.

– Disable compilation mode in System > Tools > Compilation.

– Enable all caches in your Magento, after the installation you should disable or clear the caches

– Log out from Magento admin panel and log in again to refresh your control panel.