That's not a plugin. You should read some documentation.
wp.com is using a different script called WP MU (multi user)
I see search for it and found : http://mu.wordpress.org/
but I can not see any link to download the files, where i can find the download link ?
but I can not see any link to download the files,
Then look again... and again... and again.
The big link towards the top of that page that says "Download" would be your first clue.
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