This is Post Affiliate Pro (http://www.qualityunit.com/postaffiliatepro) - Affiliate software 
from Quality Unit (http://www.qualityunit.com)

It is commercial software, and only licensed customers are permitted
to use this software. This software is copyright (c) Quality Unit.
If you have received this software without a license, you must
not use the software, and you must destroy your copy of it immediately.

For details about installation read:
https://support.qualityunit.com/706588-Clean-installation

For details about update to the latest version read:
https://support.qualityunit.com/941978-Upgrade-to-the-latest-version

For details about upgrade from PAP3 read:
https://support.qualityunit.com/206501-Upgrade-from-previous-version-3
 
For details about changes read:
https://dev.postaffiliatepro.com/posts/