El problema ocurre en android 6.0, en versiónes superiores si funciona bién

Intent i = new Intent();
i.setAction(Intent.ACTION_VIEW);

    File file = new File(path) ;

    if (android.os.Construct.VERSION.SDK_INT >= Construct.VERSION_CODES.N){
        i.setDataAndType(FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".supplier", file), "software/vnd.android.package-archive" );
    }else{
        i.setDataAndType(Uri.fromFile(file),"software/vnd.android.package-archive");
    }

    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    startActivity(i);