The proper fix is to install USU correctlly... Core files and overrides should be 1) compared against default versions of the version used in the plugin. 2) those changes should be incorporated into the store's 1.5.3 version of the file(s).
As for the separate admin directory, if the file that is an issue truly is includes/classes/db/mysql/query_factory.php then it would require a separate install of the entire fileset with the daatabase pointing to the same as thelive store.
Also, I thought that in this thread which is about how EP4 operates and how to install it (not how to install other plugins) there were some links to posts in the USU thread to resolve this issue, ie. One was to a set of files modified/incorporating the ZC 1.5.3 changes. BTW, while whatever file is replaced with the default ZC 1.5.3 version, how functional is the site? Any issues?
Some of the below links apply:
Diva Vocal's summary on the issue:
http://www.zen-cart.com/showthread.p...te#post1260554
Mc12345678 response to a similar question with a link to USU where an "updated" set of files for ZC 1.5.3 was posted on the USU thread:
http://www.zen-cart.com/showthread.p...49#post1260149
Mc12345678 post on USU with files merged for ZC 1.5.3:
http://www.zen-cart.com/showthread.p...48#post1260148
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