For Android Users (APK)
Allow Unknown Sources
Go to your phone's Settings, then Security. Enable the "Install from Unknown Sources" option. This is a standard step for installing apps outside the Play Store.
Find the Downloaded APK
Open your File Manager or check your browser's Downloads section to find the jljl77.apk file you just downloaded.
Tap to Install
Tap on the jljl77.apk file. A confirmation window will pop up. Select "Install" and wait for the installation to complete. You can now open the app.