Even the best trainer can have hiccups. Here is how to fix them:

Using a trainer is not "cheating" in a competitive sense— XCOM is a single-player game. However, using a trainer poorly can ruin the experience.

Unlimited Scientists and Engineers to speed up projects.

Some trainers include options to freeze the Meld self-destruct timer, allowing you to collect this rare resource at your leisure. How to Use the Trainer Safely