Use the launcher to set Bot count or edit the file "fh2/ai/UserSettings.ai"
Alternatively, you can edit the aidefault.ai file and remove the line
"run UserSettings.ai". Be aware that now, changes via the launcher settings will not apply.
If you want to add more than 48 bots, be sure to adjust the ratio properly.
Ratio 100 means the max bots (48) are assigned to Team 1, which is usually the Axis side, and the rest (your botcount - 48) will be added to Team 2.
Ratio 58 for example will assign 58% of the max bots the game can recognize (48) to Team 1.
That is 58x0.48 = 27.84 and that means 28 bots are going to be on the Axis side. If you now set your botcount to 75, 47 bots (75 bots overall - 28 Axis team bots) will spawn as Allied (Team 2).
Now you are good to go and all problems with adjusting the Ai should be solved.