So a fresh copy of the zc_install folder can be obtained by download ZC 1.5.3 (hotfix 1) from http://www.zen-cart.com/getit (or any previously released version for the most part) then after the checksums are confirmed (validating that all of the data made it intact with no changes) the sql file for 1.5.1 to 1.5.3 should be available to upload again. It is possible that the file did not fully/successfully transfer and just. Needs to be uploaded again. This happens sometimes. But there is still a fix supposedly to apply to that set of files to modify I think itis the functions_general.php file but if that is not where the "originals" came from, then that too could be the cause.
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