If you meant something else by "make a piece"—like a specific part of the game or creating a custom scenario —let me know so I can give you more specific steps!

: Ensure the .iso file is correctly mounted using Windows Explorer or a tool like PowerISO if you are on an older OS.

: Modern repacks are often flagged as false positives. Ensure the installation folder is excluded from your antivirus.

: Make sure your drivers and C++ Redistributables are up to date, as geopolitical sims are heavy on database processing.

: You are more likely to get favorable terms if you have captured enemy territory or depleted their military strength.