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Continue to ChatUpgrade Magento 1.x to the latest version https://blog.chapagain.com.np/update-upgrade-magento-1-x-to-latest-version-via-both-browser-command-line/
Upgrade Magento 1.x to the latest version https://blog.chapagain.com.np/update-upgrade-magento-1-x-to-latest-version-via-both-browser-command-line/