Where i can find a plug-in that can show in wordpress "/wp-admin/plugin-install.php" the download count of each plug-in?
closed as off-topic by Johannes Pille, Pieter Goosen, kaiser♦ Jul 28 '14 at 12:55
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Mark Jaquith wrote a plugin a while back that fetches data from plugins on the WordPress repo, i'd suggest taking a look at this plugin's code to get some ideas about how to query the WordPress Repository API, it's not a huge plugin so you should be able to pluck the necessary info from the main plugin file quite easily, a link to the source is posted below.
Source for main plugin file
Notably the plugin API can return the download count for a given plugin.