Probably CEP 1.53.
"text file" might be referring to the .tlk file that goes with some CEP versions.
If your game is updated to 1.69, then I would advise you to install cep169patch.hak(should be somwhere on the vault.)
How to install a hak:
- open module in the toolset
- click Module(or file can't remember)/Properties
- wait a little while
- go to Custom content tab
- add the hak
- move it to the top
- click OK, wait.)
- you should repeat these for every module of the series