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I believe that we corresponded about this same issue last week, but originally I wasn't entirely sure what .zip file you were referring to? However following a bit of research, I believe that you must be referring to the X-Plane 11 Installer.zip file that you've downloaded from LR's website as a prelude to installing your DVD set, is this correct?
If I have assumed correctly then, I have prepared a number of instructional slides that may be of assistance, per the following link :- http://questions.x-plane.com/?qa=blob&qa_blobid=13947459617875415157
Also please refer to this link, which is Laminar Research's instructions on how to install the DVD set:- https://www.x-plane.com/kb/how-to-install-x-plane-from-dvd/
I think the main issue that your having though, is how to download and unzip the X-Plane Installer.zip file, which is where my slides may help?
If you need any further information, please just let me know?
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