help for upgrade codeigniter3 to codeigniter4 in imageoptimizer project

I have a project to optimize images using codeigniter version 3. But my project is not compatible with php 7.4 . And it's very important for me to update this project to codeigniter 4 to be compatible with php7.4 . Dear friends, I ask you to guide me or if possible, update this project for me.
link for download full project file to check: https://filegap.ir/optimizer/image%20optimizer.zip
Thankful .