Well,, first of all u have to set general league crowd sizes in general.lua (copy from first page of the thread,, crowd sizes suggested by scouser), if u want afterwards to set crowd sizes for specific teams, u go to the team.lua in assignments/teams and create a lua file named with the team id u want to edit it's crowd size;
This note file should have at the beginning the assignment of the team to the tournament (league), u then set the team crowd size (check the mod documentation pdf for the scripts u have to use (there r many for the crowd size setting) one to set the crowd size for a tournament, tournament final, specific matches, specific tournament matches
Crowd sizes are set by adding the ids u need then for the sizes; 6 as full crowd for home team to 0 as empty, 3 as 50% - 2,1,0 for the away teams for 2 as full crowd size