During the game download from Steam, you can face the fact that your download may stop. How much would you not expect its completion, it will likely never be completed. To try to fix download stuck at 99% in Mafia III, do the following:
- Restart your client Steam. If the first attempt does not work, then do it several times.
- Change your download region. As in the first step, sit and experiment. At some downloading region your loading should reach 100%.
If these tips do not help you resolve the problem, then it has to wait for its correction by developers or service Steam.