Version 20.21 has been posted here:

https://www.sportsmogul.com/baseball-mogul-updates.html

Version 20.21 fixes a bug with player career paths in new games, causing older players to not decline as quickly as they should. (This, in return, caused players in their prime to decline more quickly in order to keep the talent pool balanced).

A list of fixes between 20.00 and 20.21 can be found at the above link.