I am aware that some of the subfolders in the assets folder in 1.15.2 are named differently from 1.12.2, I did change "block" to "blocks" and "item" to "items", but it doesn't seem to work.
I looked everywhere and for the life of me, I can't find a single person who attempted to do this.
I am also aware that some blocks and items names have changed, but even for example diamond_ore which has the same name for both versions, it didn't change to 1.15.2 texture.
Please, if you can tell me what I did wrong, or link me to some kind of converter, that would be amazing.
Best Answer
I haven't been able to figure it out, but I found someone on curseforge who backported it to 1.6 - 1.12 (name: Modernity) and so, I will be using their texture pack.