Generally speaking, the code has advanced from those earlier instructions to where there is now an installer for the sql portion.
The general install process is pretty much the following now:
Obtain the software from
https://github.com/mc12345678/stock_...butes_combined by selecting the green button on the right and download the zip file.
Load/merge the files found in the includes and admin folders with those of your site (there are a few files in the includes/modules and includes/templates directories that need to merge with your current template.)
Access the folder for your version of ZC, there is a single folder for both 1.5.3 and 1.5.4 because of their similarities and improvements that should be maintained regardless which version.
Access the admin install file by logging into your admin and then modifying the browser path to goto: admin/stock_by_attr_install.php
Where admin is the folder name for your admin.
Then there are two configuration groups added: Dynamic Dropdowns and Products with Attributes Stock (aka SBA) Setup, configuration settings added to Stock and one to Attribute Settings.
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