You can play the entire series with a monthly subscription. Microsoft Store: Native versions for Windows users.
If "Part 09" is missing or corrupted, the entire extraction will fail. You must re-download that specific segment.
Ensure your version matches your friends' versions. If using Steam, "Verify Integrity of Game Files."
Go to Options > Graphics and adjust the "HUD Scale" or "UI Scale" if you are playing on a 4K monitor. Lag in Big Battles: Disable "Bloom" and "Anti-Aliasing" in graphics settings.
If you already have the game and are looking for "features" or fixes to improve performance, try these steps:
Right-click Part 01 and select "Extract Here" using WinRAR or 7-Zip.