: Go to Settings > Applications and check the box for Unknown Sources . This allows the installation of APK files from third-party sites.
Installing an app on a very old OS can sometimes present problems. Here are a few common issues and their solutions: download xender old version for android 2.3 6
If you want, I can:
Here are the download links for old versions of Xender compatible with Android 2.3.6: : Go to Settings > Applications and check