My first problem was that it did not worked, I couldn't build APK. So I contacted the author, he first told me that this must be problem on mi side. So he connected to my PC via Teamviewer to fix my problem remotely. After sometime he said that he will send me next day source code fixed. That happened eventually after 6 days when I was contacting him more times. I was able to build APK but Google has rejected this app because it contains code to facilitate Ad Fraud. I am not programmer so I asked the author if he can help and he said that he doesn't know that I should ask Google, nevertheless also he offered that his paid support can sort this out. So I had to hire external developer to sort this out.
Future product updates
Quality checked by Codester
Lowest price guarantee
A regular license allows an item to be used in one project for either personal or commercial use by you or on behalf of a client. The item cannot be offered for resale either on its own or as part of a project. Distribution of source files is not permitted.
An extended license allows an item to be used in unlimited projects for either personal or commercial use. The item cannot be offered for resale "as-is". It is allowed to distribute/sublicense the source files as part of a larger project.