2. Depending on the version of the C&C games, which ones and the patched versions installed then not all trainers will work with every version. You didn't list which titles or if they were bought as part of The First Decade box set or single titles.
3. Games from Steam and Origin are always updated to the latest patch, so you will need a trainer for that patch version. Some of the older titles trainers were made not by Cheathappens but dox groups in the past before Cheathappens finally got their own trainer maker, so nothing can be done about them.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem