For Android Nougat or lower version click on Unknown sources and enable that setting. To do that go to Settings and search the word unknown

Enable app install from Unknown Sources to install apps from a third-party app other than Google Play Store.

Install the Split APK installer app and then install the downloaded mod APK using that.First of all, download the Fishdom 5.82.0 Mod Apk | ( Unlimited Coins ) APK from the above download link.If so, uninstall that before installing this one. Make sure that there should not be any prior version of Fishdom 5.82.0 Mod Apk | ( Unlimited Coins ) apk already installed on your phone. How to Install Fishdom 5.82.0 Mod Apk | ( Unlimited Coins ) APK? Once enabled, tap on the apk file to install.Or you can do it other way: Let’s say, you have downloaded the Fishdom Mod APK file on Google chrome or firefox browser on your phone.Go to Settings > Apps & notifications or go to Settings > search for unknown > Open the app (Chrome, Firefox or file manager app etc) > Install unknown apps and enable Allow from this sourceSee the below screenshots that enables to install unknown apps on Oreo for Chrome app (you need to enable on the app from where you want to install the apk):

Select the actual app through which you want to install the Fishdom mod app. – For Android Oreo or later, clicking on Install unknown apps which will take you to a list of apps. Enable app install from Unknown Sources to install apps from a third-party app other than Google Play Store.To do that go to Settings and search the word unknown– For Android Nougat or lower version click on Unknown sources and enable that setting.Install the Split APK installer app and then install this APK using that.Get the Fishdom Mod APK file from the above download link.How to Install Fishdom APK (Mod) on Android? Visit the Downloads section to download the mod APK file.

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