Here are the 4 Ways below for solving out this issue.
Install Apps Using Apk Files
Every Android App which exists out there, has an Apk file. So you could simply just take that Apk file from any of your friends via Bluetooth and other file sharing options. Once you receive the apk file in your Smartphone. Next you could browse and find the apk file using the File Manager in your Smartphone and Tap on the Apk file of that App. These days many smartphones are coming with in-built App Manager which you could use to install the app using that Apk file.
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From Customer point of view really good feature is that you could “Test Drive” the premium/Paid Apps before purchasing them.
Using APTOIDE to Install Apps
APTOIDE is one more Google Play Store alternative. This is also an App Store where Developers are free to share their newly developed apps with users and gain user reviews about how the app is and what are the necessary changes and improvements needed in those apps. Connecting to APTOIDE is really easy and could be done via linking to any social accounts like Facebook, Google Plus and more. So that’s it just connect to your Social account and then freely download any of the available apps from here. However there is no word about the security and authenticity of those aps.
Using Slide ME to Install Apps
Another Interesting Play Store alternate is Slide ME. Its basically just another App Store where users can find a wide variety of free and paid apps. Here over more than 70% Apps are free and its preferred by New Developers to launch their original or Beta apps so users interested in downloading new apps before the actual arrival of apps on Google Play Store can easily find those apps here.