1st) i need know what android version you using .
2nd) what android installer you using.
and i take it we are talking about Final Fantasy VIII Remastered as final fantasy vIII
That port was based on VIII's PC version, resulting in a Steam transference that was significantly rougher around the edges. The long-term effect of this is that VIII was absent when VII and IX were ported to Android and iOS in 2015. Coming from the PC code, VIII was incompatible with mobile technology
some helpful info
Android 8.0 Oreo and later
Google changed how APK installations work in Android 8.0 Oreo. It hasn’t changed much since. This is how to install APKs on all modern versions of Android:
Download the APK you want to install.
You can either navigate to your Download folder using a file browser app or simply begin the install by clicking on the completed download in your mobile browser.
Android will ask you to grant permission to either the file browser or your web browser to install the app. Grant the permission and it should bounce you back to the installation screen. If not, navigate back to your Download folder after granting the permission to try again.
The app should be safely installed.
It will work like any other app you download. You can find the icon in the app drawer, open the app, and do whatever. There are some apps that may not install on your device due to compatibility reasons. Many apps with Internet permissions may hound you to download the latest version on the Google Play Store before it’ll let you use the app. There isn’t much you can do about that if it happens.
Install from Unknown Sources method (old method)
Before Android Oreo, users had to enable the Install from Unknown Sources setting to install third-party APKs on their devices. The process otherwise remains mostly the same.
Download the APK you want to install.
Navigate to your phone settings menu then to the security settings. Enable the Install from Unknown Sources option.
Use a file browser and navigate to your download folder. Tap the APK to begin the installation process.
The app should safely install.
Everything we said earlier still applies here. Some apps may simply not install for compatibility reasons and apps may hound you to get the updated version from the Play Store before it lets you use the app. This method only works on devices running versions of Android older than Android Oreo.
A photo of Amazon's Appstore starting up
Third party app stores
Choose the third party app store you want and download the APK.
Follow the steps above to install the APK to your device.
Once the store is installed, open it up and surf for whatever apps you want. Download and install them as you would any other app store.
On devices running Android Oreo or higher, make sure you grant the app store permission to install apps to avoid problems. Those on older versions of Android need to make sure the Install from Unknown Sources option or installs will fail.
You should be able to open your new third party app store, download apps, and install them without worries. To be frank, most apps you find on most third party apps stores are available in the Play Store anyway. However, there are some exclusives here and there. Plus, F-Droid in particular is a neat place for some power user tools and stuff like that.
The best third party app stores for Android
Amazon Appstore
APKMirror
APKPure
APKUpdater
Aptoide
F-Droid
Humble Bundle
QooApp
Samsung Galaxy Apps
Yalp Store