If donwload doesn't starts automatically then
to restart downloading
First download the Vidmate APK file
Click on downloaded Vidmate APK file which will popup like this
Click on "Install" button to start installation.
You may also need to enable "Install unknown apps" permission in your android phone in it isn't already enabled.
Once you enabled the permission, again click on donwloaded .apk file
Click on "Install" button to start installing Vidmate