The expression refers to obtaining the installation package for the Android 5.0 operating system, also known as Lollipop. An APK, or Android Package Kit, is the file format used by the Android operating system for distribution and installation of mobile apps and middleware. It essentially contains all the elements an application needs to install correctly on a device. For instance, locating and acquiring the file might be necessary for installing software on an older device still running this operating system version, or for creating an emulator environment.
Accessing this particular installation file can be important for users seeking to revive or maintain older devices, develop applications targeting this specific Android version, or troubleshoot compatibility issues. This version introduced Material Design, a design language focusing on visual elements and user experience, and therefore remains relevant for studying interface design evolution. Understanding the distribution and deployment of software packages from this era offers insight into the historical progression of the Android ecosystem and mobile application development practices.