This usually means part2 (or whichever part is cited) did not download completely. Delete that specific part and download it again.
Once extraction is finished, you will typically see one of the following in your folder: Deus.Ex.Human.Revolution.Complete.Edition.part2...
Right-click it and select Mount (on Windows 10/11) to treat it like a virtual disc. Run setup.exe from the new drive that appears. This usually means part2 (or whichever part is
Sometimes the files are "pre-installed." In this case, look for DXHR.exe or DXHRDC.exe inside a bin or system subfolder to launch the game. 4. Common Troubleshooting Deus.Ex.Human.Revolution.Complete.Edition.part2...
Right-click on the file ending in .part1.rar and select "Extract Here" or "Extract to [Folder Name]" .