I can not help you with downloading copyrighted content but I can guide you through the process of obtaining Overlord (2018) legally.

Here's a sample post you can use:

"Hey everyone! I'm excited to share with you a great way to watch Overlord (2018) legally. You can find the movie on streaming services like [insert streaming services available in your region] or buy/rent it from online stores like [insert online stores]. Make sure to support the creators by obtaining the movie through legitimate sources. Let's enjoy the movie while respecting the hard work of the filmmakers!"