Searching for "HD" versions of a pixel art game shows a misunderstanding of the game's graphics. Unpacking is pixel art; it scales to your screen resolution. There is no "SD vs HD" version. Malicious actors use "HD" or "4K" as a buzzword to lure you into clicking their infected link.
If you choose to go ahead, at least protect yourself:
Before we discuss downloads, let's appreciate the game itself. Unpacking is not your typical action or puzzle game. It is a meditative, zen-like experience where the gameplay loop is exactly what the title suggests: unpacking boxes and arranging items in a new home.
Key Features:
The game was developed by a small team (Witch Beam). When you pay for the game, you are directly supporting independent artists, programmers, and storytellers. Piracy of indie games is particularly damaging because the profit margins are already razor-thin.
If you need free PC software or HD media, consider legitimate sources:
For unpacking practice without risk, use safe sample files from sources like github.com (test archives) or built-in OS tutorials.