Step 1: Before installing the .APK file you need to select install unknown sources. For that you need to go to settings > Security.
Step 2: Get .APK file from this Vidmate APK download location, Click HERE
Step 3: Click on .APK file and follow instructions carefully to complete the installation. If you want installing procedure then read below steps as well. If you are well known of installing .APK then you can skip this.
Step 4: Now tap on downloaded .APK from the browser or else location of file downloaded. After that accept everything and wait for sometime.
Step 5: Boom!! Vidmate has been installed correctly in your device. Now open and watch millions of videos for free.
I hope I clarified everything about application download & Vidmate.