Increased Plugin Installations for WordPress

The task is not only to increase the number of installations of the free version of the gift certificate plugin, but also to make the sales of the advanced version profitable. Before the start of the work, it was known that 7% of users who installed the free version, within 90 days, buy an extended for $49 (42 euros). Thus, the point of profitability of the project is achieved at the cost of the free installation of €2.94.
The result: Increased profitability point after 1 month of advertising campaign. Achieving the price of the plugin installation is 1.5 Euro in 2 months and 10 days.
Tool: Google Display Network