Also, you might want to come up to 1.5.8a if you are relying on PayPal. There have beren a LOT of changes since 1.5.6c. Most problematic of all is that most servers/hosts are dropping PHP 7.4 and 1.5.6c is designed for PHP 7.3. Your database could start throwing errors as well. 1.5.8a works with a higher database version as well.
Not trying to throw scare tactics at you but, the longer you wait, the more difficult you may find your upgrade to be. In your case, I would recommend starting at
https://docs.zen-cart.com/user/upgra...ation-optional
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