if you just want to hotswap from your cache, this was the video: https://www.youtube.com/watch?v=Pg7vnMmdOao
they removed it recently, but that doesnt matter because the technique doesn't work anymore anyway due to loadbundle not knowing how to deal with unity2019

the modern/working method of hotswap is using this:
https://github.com/LargestBoi/A.R.E.S/releases

relevant video: https://www.youtube.com/watch?v=WFuB8ycALhA