How to activate Slaido plugin

Starting with this file: your-domain\wp-content\plugins\slaido\slaido.php, at the 81th line , find:

if ($slaido_key != "") {)
if ($slaido_key != "") {
$v ="1";
}else {
$v="";
}

Change the second-last line to

$v ="1";

Now you can activate the plugin with any key.