AC Valhalla updates often change the required emp.dll version. A random download will likely cause a "not designed to run on Windows" error.
To summarize the working fix:
Run the installer for the crack, or download the emp.dll from the original, trusted source of your game version. Copy it to the game directory. Crucially , apply the exclusion in step 1 immediately. Risks of Downloading emp.dll from Third-Party Sites ac valhalla empdll fix work
If the file was completely deleted and cannot be restored from history, you must replace it manually. Check your original game installation download or ISO file. AC Valhalla updates often change the required emp