Have a look on the below resources for better understanding.
What is Dynatrace AppMon 2017 May And How to Get Started
Deploying, Upgrading and Migrating Dynatrace AppMon
Do we need to procure extra license if we upgrade version 6.3 to 7.... We will be setting up new structure for 7 and if it works fine with no issues then we will remove the 6.3 version. It means both will be running for one month on overlap. We are not installing new version on top of old one. For this scenario do we need an extra license procurement? @Babar Q.