While Android 5.1 is an older platform, using the Google Play Store is the best way to maintain some level of security. It provides Play Protect, which scans your apps for malicious behavior. By manually updating to the latest possible version for your OS, you ensure that you have the most recent security patches available for that generation of Android.
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Android 5.1, also known as Lollipop, was a significant release back in 2015. While it's an older version, many devices still run on this OS, and users may want to access the Google Play Store to download apps, updates, and other content. By downloading the Google Play Store APK, you can: google play store apk link download for android 51