This is an old guide. The updated guide can be found here --> https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2514089452

Because some people wanted me to do this for other mods, but I can be lazy sometimes.
Use Notepad++ to edit multiple files at once using the find and replace in all open documents. Then quickly save the changes by closing Notepad++ and repeatedly pressing enter to save changes before closing.

1. Download the mod which you wish to ruin and 1 credit 1 second core

2. Navigate to the Empire at War workshop folder C:\Program Files (x86)\Steam\steamapps\workshop\content\32470

3. Open the folder for the mod which you wish to ruin. The name of the folder will be the steam worshop ID. For example, thrawns revenge would be 1125571106

4. Open the folder Data\XML\Units folder, there may also be more folders with upgrades, heroes, or other units which you will also need to open depending on the mod

5. Open every XML file containing units, and do the following

For 1 credit 1 second, change the following to 1

• Find: <Tactical_Build_Time_Seconds>.*</Tactical_Build_Time_Seconds>
  
• Replace: <Tactical_Build_Time_Seconds>1</Tactical_Build_Time_Seconds>
  
  
• Find: <Tactical_Build_Cost_Multiplayer>.*</Tactical_Build_Cost_Multiplayer>
  
• Replace: <Tactical_Build_Cost_Multiplayer>1</Tactical_Build_Cost_Multiplayer>
  
  
• Find: <Build_Cost_Credits>.*</Build_Cost_Credits>
  
• Replace: <Build_Cost_Credits>1</Build_Cost_Credits>
  
  
• Find: <Build_Time_Seconds>.*</Build_Time_Seconds>
  
• Replace: <Build_Time_Seconds>1</Build_Time_Seconds>

For infinite unit cap, do the following

• Find: <Population_Value>.*</Population_Value>
  
• Replace: <Population_Value>0</Population_Value>

Now this could probably be done by finding the script used to build units, and making it so that instead of calling the variable, it uses the number 0 or 1, but I don't know where that script is, or if it is some part of the executable that can't be easily changed.