Was this a core module shipped with v157 and is the version available on Square's website the most up-to-date version? https://squareup.com/us/en/app-marketplace/app/zen-cart
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Was this a core module shipped with v157 and is the version available on Square's website the most up-to-date version? https://squareup.com/us/en/app-marketplace/app/zen-cart
Both are the same.
Also, if the module is updated you will see a notice in your Admin if yours needs upgrading.