MWA HA HA HA HA !!!!! SILLY NEWBIE!
Seriously, though........
It will allow you to have rosters through the beginning of the 2003 season.
To get the most up-to-date rosters...go
HERE. Joe should have the best ones....with trades, signings and whatnot.
Baseball Sim Central has some good ones as well.
Secondly, just download the the Lahman database into a separate folder on your hard drive. If you want to create a historical league, just choose that option, type in the path
(eg: C:\LAHMAN), and follow the prompts. OOTP will do the rest.
Hope that helps.....