It's in the same location it has been all along, go to the first post of this thread, there is a link to the current version of EP4 on github, which has been updated to work with 1.5.3 as well as continuing to work with the previous versions. As noted in the change log(s), ZC 1.5.2 was not considered for incorporation.
As for the download option from ZC, the instructions are under development and the primary hold up on why this has not been submitted as an official ZC plugin.
I am part of that problem as I incorporated some functionality to support a version of Stock by Attributes and need to write applicable instructions for it's use.
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