What do you need?

1. Apache (mod_rewrite ON)

2. PHP >= 5.5 (cURL + mcrypt + memcache + mbstring)

3. MySQL (optional for blacklist).

Instructions:

Step 1: download tarball (or clone repo) and upload to your server.

Step 2: install composer dependencies -> $ php composer.phar install

Step 3: remove ALL /config .sample extension and edit miscellaneous.php and any other file you need.

Step 4: prepare virtual host and point document root to megacrypter public dir.

Step 5 (optional): ask developers of your favourite download manager to recognize your new megacrypter links.

You're alone from here. Good luck!