What does the error message say? Windows 11 should be able to extract the archive even without installing 7zip. The topmost 7zip download should be the one you want ( Windows x64 (64-bit) ).
Without 7zip:
1. Right click and select "Extract All".
2. Select a destination or just leave as default.
3. The extraction process will create a new folder with all the game files.
4. Open the folder and run HardStuck.exe.
With 7zip:
1. Right click and select 7zip/Extract to "HardStuck.......".
2. The extraction process will create a new folder with all the game files.
3. Open the folder and run HardStuck.exe.
You could also try downloading the game again, if the download got interrupted it might have corrupted the archive file.