The "Fixed EXE" is a NoCD.
The original version of Curse: The Eye of Isis shipped with the evil StarForce v3 so wouldn't work on modern Windows without the NoCD.
Linda333 seems to have a reissue version that doesn't have the StarForce.
The Trainer on the gamecopyworld page is called Curse v1.0 +2 TRAINER
So that's what Linda would need to download.
There is also a trainer at cheathappens.com, and a little more description of ithttps://www.cheathappens.com/8043-PC-Curse_The_Eye_of_Isis_cheats
They claim it's for Windows 7 and below.
How to use a trainer probably depends on the trainer. Usually they come as a zip or rar file that contains instructions.
It's been a long time since I used a trainer, and I don't remember if I started the game first and then ran the trainer or if I ran the trainer first and then the game. The trainer I had used hotkeys for god mode. This was over 15 years ago on Windows 98, so it's probably more difficult to run them now because of Windows security. A lot of trainers are wrongly flagged as virus because they use keyloggers.
I found this forum with instructions for trainers.https://mrantifun.net/index.php?threads/how-to-use-a-trainer.12076/