Hello,
Make sure the scripts are in the 'Assets' > 'Scripts' folder.
Then ensure you have listed the Scripts in > Scripts > campaigns files,
e.g. BORG CUSTOM
Name="Borg Custom"
Description="Play custom missions as a member of the Borg Collective"
EarlyMapName="Multi.mvm"
MidMapName="Multi.mvm"
LateMapName="Multi.mvm"
DifficultyLevel=1
Era=0
TriggerMission=""
TriggerPrestige=0
[Missions]
1="Kar_ConvoyRaid.scr"
2="Kar_ConvoyEscort.scr"
3="Kar_EnemySweep.scr"
4="Kar_HomelandDefence.scr"
5="Kar_Ambushee.scr"
6="Kar_DeepSpace.scr"
7="Kar_HoldtheLine.scr"
8="Kar_Skirmish.scr"
9="Kar_JointOps.scr"
10="Kar_CounterPunch.scr"
11="Kar_CombinedArms.scr"
12="Kar_SquadronAction.scr"
13="Kar_FleetAction.scr"
14="Kar_JointOps_tw.scr"
15="Kar_CounterPunch_tw.scr"
16="Kar_CombinedArms_tw.scr"
17="Kar_SquadronAction_tw.scr"
18="Kar_FleetAction_tw.scr"
19="Meta_Scan.scr"
20="Meta_DistressCall.scr"
21="Meta_SupriseR.scr"
22="Meta_Ambush.scr"
23="Meta_Emergency.scr"
24="Meta_Scout.scr"
25="Meta_Maquis.scr"
26="Meta_Assimilate.scr"
27="Meta_Survey.scr"
28="Meta_Delivery.scr"
29="Meta_Escort.scr"
30="Meta_SunMission.scr"
31="Meta_Monster.scr"
32="Meta_Derelict.scr"
33="Meta_Rescue.scr"
[Races]
0=3
The name in the list must match exact name in the scripts folder.
If you start a new game using the same install then delete the 'AllScripts' and 'CampaignScripts' in the scripts folder or the game gets confused.
Hope that helps,
Worfy