Baseball Mogul 2020 now includes a 60-game schedule* for this season. You can download a text version of the schedule here.
The newest patch includes this schedule and some additional features for the shortened season. For example, the Roster Rules now have a checkbox to prorate player salaries — as is being done for the current season. And the League Editor has an option to start each inning after the 9th with a runner on 2nd base (also a new rule this year).
To play the 60-Game season (which includes these rules changes) in Baseball Mogul 2020:
1. Start a New Game.
2. Click the "Custom" button.
3. Click "Load Database".
4. Choose "Database File" and click "PLAY".
5. Select "60-Game Season (2020)" and click "Open".
You can still play the full 2020 season (with the official 162-game schedule) by starting a new game and clicking "Modern".
*Note: The 60-game schedule is not the official MLB schedule, because I don't currently have access to this data. If you are able to find (or build) the real schedule matching this format, email it to me and I'll include it in the next patch. Thanks!