If you completed all steps, enjoy taking Manchester United's 2013 squad (with Robin van Persie in his prime) to Champions League glory.

: Install official Update 1 and Update 2 (Patch #2) before applying custom databases to ensure system stability. Administrative Rights

file in your Documents folder has any necessary limitation overrides, such as IGNORE_LEAGUE_LIMITATION=1

This usually indicates a corrupted database file or a conflict with old save files.