Do you for real asking such a question:)? how to zip a file? or you want to ask what structure zip file must be? because it doesnt uplaod trough extension installer? maod_name.ocmod.zip the file name and inside install.xml file (if opencart2.x) then upload folder also must be included into zip file (no matter that it may be empty)
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Which of these two possibilities are you looking to achieved?
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Until now you have posted here 2 questions!
Both about troubles you have.
About the structure, read here: https://github.com/opencart/opencart/wi ... ion-System
And if you develop a new extension, you should be able to read that documentation (and understand).
But if your development knowledge is based on posts like that (yesterday posted):
it would be better to let ist - the marketplace is full of crappy extensions!.. am really new to opencart ..