Finding PhotoSweeper Trash to Delete Duplicate Photos

Where is the PhotoSweeper trash folder? I cannot find it in neither the Photos app nor the iPhoto app.

I have a mid-2012 Macbook Pro with a 500gb SSD. Suddenly the disk space was reduced to practically zero. I researched online and found that somehow the new Photos app had duplicated all my pictures and videos. I deleted some miscellaneous things and now I am currently at 28.86gb free. I should, however, have over 100gb free. In my research, I learned I could purchase PhotoSweeper, which would located all duplicates. I purchased it and sure enough the duplicate photos/videos were found--well over 100gb worth. I then used the same PhotoSweeper app to send them to the trash. I went to the bottom of the screen to empty the trash but couldn't find the photos/videos there. So, I did more research and learned that the trash is actually to be found in the Photos app. Here's the problem--it is not there. I then went to the iPhoto app and could not find the trash there either. Finally, I wrote PhotoSweeper and they simply copy and pasted a basic answer that told me to do what I had already done.

I am quite new to macbooks. I am used to the world of Windows where you just find the file and delete it. Can somebody show me how to get to those duplicate files and delete them, so I can free up the space on my computer?

Thank you in advance!

PS: This problem occurred just before I installed the SSD, but thinking it would be an easy fix, and being in a rush, I just cloned the old drive to the new SSD. I say that to say that the SSD had nothing to do with this issue.