How to fix Theme Install Failed Issue
To zip/unzip files like in this tutorial download winrar https://www.win-rar.com/download.html...
Sometimes when we try to upload a theme zip package via WordPress admin panel, it will fail to upload slapping an error message "theme install failed".
This tutorial will work for plugin upload too.
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Note - We have utilized WinRar (free version) to zip/unzip files. If you don't have this software, download and install it for free. It will not take more than a few seconds to download and install this small software.