If you are playing in Windows, you can use
CheatEngine for that.
For the install you would either need to uncheck some extra 'offers', or install it while offline. There is also a
no-install rar file on the downloads page. If you don't already have an archive manager that can handle rar files, try the freeware
7-Zip.
Here is a
CheatEngine table I downloaded from
this topic (broken link) when it was still available. It wasn't updated for the latest version of the game, but works for what I've tried with it (adjusting abilities and talents).
Start the game and load a save, open the table (I just extracted it into the CheatEngine install folder), click the 'Select a process to open' button at the top left (highlighted with a flashing box cycling between red and green), select EoCApp.exe (preceded by a hex number, ie 00001FD0-EoCApp.exe) and click the Open button and then Yes. In the bottom list there are options for unlimited health, unlimited action points, etc, which I have not tried. I believe they should take effect immediately.
For character edits, select Hero Pointers, then go through Hero 1 to 4 to identify the right character. There is an 'Upgrade Points' section where you can add attribute, ability and talent points, and sections for each of those where you can remove/adjust values. Double click the value to change, and when you are done, switch back to the game to save/load. Character changes require a save/load to get them to show up in-game.
If you can not select the boxes at the bottom in CheatEngine, exit the program and the game and start over. That happened to me a couple times. There may be an easier fix, but I haven't used CheatEngine enough to bother trying anything else.
