How to find duplicate installers or setup files?

I’ve noticed that over time, my PC ends up with multiple copies of the same installer or setup files, especially when I forget I’ve already downloaded them. This eats up storage space and makes file management a hassle. I’m looking for the best ways or tools to identify and remove duplicate setup files safely. Are there any reliable methods or software you recommend for finding duplicate installers without risking important data? Also, is there a way to prevent this from happening in the first place? Would love to hear your tips!