Ensure that the following configuration is set correctly on your mobile.
OnTAP is a free solution. Some mobiles come with default settings which can prevent the installation of OnTAP, especially if you are not installing from Play Store.
Open the Settings. Depending upon your Android version the same would be found
in Security section or Application settings.
Please check that "Unknown Sources" option is checked.
Illustrations can be seen below...
INSTALL FROM DOWNLOAD
If you are installing from our server viz bitsmartsln.net/downloads/OnTAP.apk
Once the download is complete, and you try to click on the same then some mobiles may not allow you to open the apk for installation.
Open File Browser [Different mobile provides different file browser]
Click on Download
You would see OnTAP.apk. Click on the same and the installation would start, Follow the process.
If you are still having trouble.
Feel free to call us @ 9822494993 and we will help you with the application installation and registration.