The preferred way to install this extension is through composer.
Either run
php composer.phar require --prefer-dist denisbespyatov/upgradeui "*"
or add
"denisbespyatov/upgradeui": "*@dev"
to the require section of your composer.json file.
All you need is register denisbespyatov\upgradeui\assets\Asset in your layout. This extension consists a layout example. You can find it in denisbespyatov\upgradeui\views\layouts\db-main.php.