If you want to play legally, your only option is to buy a (e.g., on eBay) or purchase an unused Steam key from a reseller (prices are often very high, $100+). For most, the repack route is the only practical one, but avoid anything that promises a 10GB game in a 300MB file—that is a scam.
To get the best version of the Deadpool game (released in 2013), follow these guidelines: download deadpool pc game highly compressed better
DODI offers a "Better" variant focused on low-end PCs. Download Deadpool PC Game Highly Compressed - Better
: You can still find used physical discs for PC (or consoles like PS4/Xbox One) on sites like eBay. This is the only 100% legal way to own the game now. Steam Keys Expected Size: The full game is roughly 5