In looking at the page source, there is something else amiss such that the replace tool may not be the tool to use.
First, I get a re-direct to moscertificationtraining.com/learn - no www. That means the config.php file is set for www.domain/learn and it should be set for domain/learn. Try that first to see if images show. All the links one can see in viewing the source point to www.domain/learn/blah/image.jpg, etc.
The image above the "Microsoft Office" text is a base64 data for a jpg (delete/reupload and link). The "Money" image looks like it's whacked (delete and reupload/link). And the "Business Plan Creation" image ... same. In viewing source can see img tags pointing to the current domain/location, but think the images on the front page themselves may have been corrupted on transport from old site to new.
In other words, delete, re-upload and link them if they don't show.
If, after doing that, they still don't appear check into 'slash arguments' on/off.
'spirit of sharing', Ken