Upgrades are new releases of an app and may require an additional fee from you to pay the owner of the app before you can install them.
Upgrades are the updates of apps to the latest version. These upgrades are the new features that are added by the app developer. Some apps are free and some require to pay before using them. The apps that require payment before installing on a mobile phone or software application for your PC, require to pay a fee as the developer adds new features to them.
For example, if you are using a learning management system (LMS) that is developed by an educational authoring tools organization. When they upgrade the LMS, you need to pay them additional fees to use the upgraded version of the LMS. An upgraded version of LMS may contain additional features and functionality etc.
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