Cliff of Dover Launcher has encountered a problem and needs to close

[ICDP]

Go to your CoD folder, usually it can be located somewhere like this:

C:\Users\<your username>\Documents\1C SoftClub\il-2 sturmovik cliffs of dover

You should see a file called conf.ini

Delete or rename that file and try restarting CoD.

Also make your you have steam cloud turned off in Steam so that it doesn't keep overwiting the conf.ini with the default one.