The build architecture (e.g., ARM64 vs. ARMv7) is incompatible with your old processor. "App Not Installed"
Practical advice
If you are looking for a specific type of application (e.g., a file manager, browser, or utility) that matches this version number, Download APK File -Android 2.3.3- v3.6.6-512
In vintage Android nomenclature, this frequently refers to an architecture, build target, or a specific optimization metric (such as for devices limited to 512 MB of RAM , which was the standard flagship memory size during the Gingerbread era). Why Do People Still Use Gingerbread? The build architecture (e