Millennium Dawn. Even small submods can cause "unexpected application quits" during history updates.
If your game is crashing specifically in 2021 or 2022 during EU-related events, you can bypass the bugged flags using the console. Open the console with the tilde key ( ~ ) and enter the following commands sequentially: Steam Workshop::[FIXED] Millennium Dawn EXPANDED!
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Click and wait for the process to finish. Match Mod and Game Versions
Because Millennium Dawn can easily max out 8GB or even 16GB of system RAM, Windows needs to use your hard drive/SSD as temporary memory (called a Pagefile). If your Pagefile size is managed automatically or too small, HOI4 will crash instantly when it runs out of memory. How to Increase Your Virtual Memory: Millennium Dawn
: Turn on submods one by one to find the exact file causing the conflict.
: High speeds (4x or 5x) increase the likelihood of calculation conflicts in this heavily scripted mod. Play at speed 3 or lower during intense late-game periods. Troubleshooting Checklist If the above steps fail, follow these standard procedures: Open the console with the tilde key (
: Use the Steam "Verify Integrity of Game Files" tool to ensure the base game and mod files are not corrupted.