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I've just shared a solution for migrating Piwik from 1.12 to 2.15.0:

http://stackoverflow.com/q/33549936/282073

Hint: Always read the documentation ...
See also http://piwik.org/faq/how-to-install/faq_18271/ ^_^

P.S. Piwik is an open-source analytics platform,
which can be downloaded from https://piwik.org