Open the new main comp, select a layer, and hold while dragging the new pre-comp from the Project Panel onto the layer to replace it. It takes longer, but it’s 100% free and safe.
For those who might be landing here looking for a workflow solution: is a script for Adobe After Effects that allows you to duplicate a composition along with all its nested pre-comps. true comp duplicator v3 free download
While it's tempting to look for a "free download" or a "crack" for premium plugins, there are some serious risks and better alternatives you should consider before downloading files from unofficial sites. What is True Comp Duplicator? Open the new main comp, select a layer,