Since some people used to mistake Integration for Installation therefore this article clarifies that those 2 words refer to completely different actions.
Integration usually means adding a few lines of code into an e-commerce site in order to connect it with Post Affiliate Pro in terms of tracking affiliate-referred clicks, sales/leads.
More detailed explanation is available here:
The installation is the process of uploading the files of Post Affiliate Pro to a server and following the step-by-step instructions here:
NOTE: In case of a hosted solution of Post Affiliate Pro there is no installation carried out by the customer, since the installation happens automatically in the background once the customer registered (purchased) an account.