Ensure you have the latest NVIDIA or AMD drivers installed.
If you are seeing a "Checksum Error" or "Corrupt Archive" message for this specific part, you can try the following steps to fix it without redownloading the entire set: 🛠️ Common Fixes for Archive Errors UNCHARTEDLegacyThievesCollection.part15.rar
Check your antivirus history to see if it blocked u4.exe or tll.exe . Adding an exception for the game folder often fixes "failed to save" or launch errors. Ensure you have the latest NVIDIA or AMD drivers installed